diff --git a/src/Mod/Start/Gui/CMakeLists.txt b/src/Mod/Start/Gui/CMakeLists.txt
index 5d6559e9fd..863164955f 100644
--- a/src/Mod/Start/Gui/CMakeLists.txt
+++ b/src/Mod/Start/Gui/CMakeLists.txt
@@ -53,14 +53,20 @@ SET(StartGui_SRCS
         FileCardDelegate.h
         FileCardView.cpp
         FileCardView.h
+        FirstStartWidget.cpp
+        FirstStartWidget.h
         FlowLayout.cpp
         FlowLayout.h
+        GeneralSettingsWidget.cpp
+        GeneralSettingsWidget.h
         Manipulator.cpp
         Manipulator.h
         PreCompiled.cpp
         PreCompiled.h
         StartView.cpp
         StartView.h
+        ThemeSelectorWidget.cpp
+        ThemeSelectorWidget.h
         )
 
 SET(StartGuiIcon_SVG
@@ -68,6 +74,12 @@ SET(StartGuiIcon_SVG
         Resources/icons/PartDesignWorkbench.svg
         )
 
+SET(StartGuiThumbnail_PNG
+        Resources/thumbnails/Classic512.png
+        Resources/thumbnails/OpenDark512.png
+        Resources/thumbnails/OpenLight512.png
+        )
+
 # TODO: Evaluate PCH use with Qt6/QtQuick/Qml
 if (FREECAD_USE_PCH)
     add_definitions(-D_PreComp_)
@@ -75,7 +87,7 @@ if (FREECAD_USE_PCH)
     ADD_MSVC_PRECOMPILED_HEADER(StartGui PreCompiled.h PreCompiled.cpp PCH_SRCS)
 endif (FREECAD_USE_PCH)
 
-add_library(StartGui SHARED ${StartGui_SRCS} ${StartGuiIcon_SVG})
+add_library(StartGui SHARED ${StartGui_SRCS} ${StartGuiIcon_SVG} ${StartGuiThumbnail_PNG})
 # target_link_libraries(StartGui ${StartGui_LIBS} Qt::Quick Qt::Qml Qt::QuickWidgets)
 target_link_libraries(StartGui ${StartGui_LIBS})
 
diff --git a/src/Mod/Start/Gui/FirstStartWidget.cpp b/src/Mod/Start/Gui/FirstStartWidget.cpp
new file mode 100644
index 0000000000..b506b382e7
--- /dev/null
+++ b/src/Mod/Start/Gui/FirstStartWidget.cpp
@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/****************************************************************************
+ *                                                                          *
+ *   Copyright (c) 2024 The FreeCAD Project Association AISBL               *
+ *                                                                          *
+ *   This file is part of FreeCAD.                                          *
+ *                                                                          *
+ *   FreeCAD is free software: you can redistribute it and/or modify it     *
+ *   under the terms of the GNU Lesser General Public License as            *
+ *   published by the Free Software Foundation, either version 2.1 of the   *
+ *   License, or (at your option) any later version.                        *
+ *                                                                          *
+ *   FreeCAD is distributed in the hope that it will be useful, but         *
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of             *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU       *
+ *   Lesser General Public License for more details.                        *
+ *                                                                          *
+ *   You should have received a copy of the GNU Lesser General Public       *
+ *   License along with FreeCAD. If not, see                                *
+ *   <https://www.gnu.org/licenses/>.                                       *
+ *                                                                          *
+ ***************************************************************************/
+
+#include "PreCompiled.h"
+
+#ifndef _PreComp_
+#include <QGuiApplication>
+#include <QHBoxLayout>
+#include <QLabel>
+#include <QPushButton>
+#include <QResizeEvent>
+#include <QVBoxLayout>
+#include <QWidget>
+#endif
+
+#include "FirstStartWidget.h"
+#include "ThemeSelectorWidget.h"
+#include "GeneralSettingsWidget.h"
+
+#include <App/Application.h>
+#include <gsl/pointers>
+
+using namespace StartGui;
+
+FirstStartWidget::FirstStartWidget(QWidget* parent)
+    : QGroupBox(parent)
+    , _themeSelectorWidget {nullptr}
+    , _generalSettingsWidget {nullptr}
+    , _welcomeLabel {nullptr}
+    , _descriptionLabel {nullptr}
+    , _doneButton {nullptr}
+{
+    setObjectName(QLatin1String("FirstStartWidget"));
+    setupUi();
+    qApp->installEventFilter(this);
+}
+
+void FirstStartWidget::setupUi()
+{
+    auto outerLayout = gsl::owner<QVBoxLayout*>(new QVBoxLayout(this));
+    QString application = QString::fromUtf8(App::Application::Config()["ExeName"].c_str());
+    _welcomeLabel = gsl::owner<QLabel*>(new QLabel);
+    outerLayout->addWidget(_welcomeLabel);
+    _descriptionLabel = gsl::owner<QLabel*>(new QLabel);
+    outerLayout->addWidget(_descriptionLabel);
+
+    _themeSelectorWidget = gsl::owner<ThemeSelectorWidget*>(new ThemeSelectorWidget(this));
+    _generalSettingsWidget = gsl::owner<GeneralSettingsWidget*>(new GeneralSettingsWidget(this));
+
+    outerLayout->addWidget(_generalSettingsWidget);
+    outerLayout->addWidget(_themeSelectorWidget);
+
+    _doneButton = gsl::owner<QPushButton*>(new QPushButton);
+    auto buttonBar = gsl::owner<QHBoxLayout*>(new QHBoxLayout);
+    buttonBar->addStretch();
+    buttonBar->addWidget(_doneButton);
+    outerLayout->addLayout(buttonBar);
+
+    connect(_doneButton, &QPushButton::clicked, this, &FirstStartWidget::doneClicked);
+    retranslateUi();
+}
+
+void FirstStartWidget::doneClicked()
+{
+    auto hGrp = App::GetApplication().GetParameterGroupByPath(
+        "User parameter:BaseApp/Preferences/Mod/Start");
+    hGrp->SetBool("FirstStart2024", false);
+    this->hide();
+}
+
+bool FirstStartWidget::eventFilter(QObject* object, QEvent* event)
+{
+    if (object == this && event->type() == QEvent::LanguageChange) {
+        this->retranslateUi();
+    }
+    return QWidget::eventFilter(object, event);
+}
+
+void FirstStartWidget::retranslateUi()
+{
+    _doneButton->setText(tr("Done"));
+    QString application = QString::fromUtf8(App::Application::Config()["ExeName"].c_str());
+    _welcomeLabel->setText(QLatin1String("<h1>") + tr("Welcome to %1").arg(application)
+                           + QLatin1String("</h1>"));
+    _descriptionLabel->setText(
+        tr("To get started, set your basic configuration options below.") + QLatin1String(" ")
+        + tr("These options (and many more) can be changed later in Preferences."));
+}
diff --git a/src/Mod/Start/Gui/FirstStartWidget.h b/src/Mod/Start/Gui/FirstStartWidget.h
new file mode 100644
index 0000000000..0965d80424
--- /dev/null
+++ b/src/Mod/Start/Gui/FirstStartWidget.h
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/****************************************************************************
+ *                                                                          *
+ *   Copyright (c) 2024 The FreeCAD Project Association AISBL               *
+ *                                                                          *
+ *   This file is part of FreeCAD.                                          *
+ *                                                                          *
+ *   FreeCAD is free software: you can redistribute it and/or modify it     *
+ *   under the terms of the GNU Lesser General Public License as            *
+ *   published by the Free Software Foundation, either version 2.1 of the   *
+ *   License, or (at your option) any later version.                        *
+ *                                                                          *
+ *   FreeCAD is distributed in the hope that it will be useful, but         *
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of             *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU       *
+ *   Lesser General Public License for more details.                        *
+ *                                                                          *
+ *   You should have received a copy of the GNU Lesser General Public       *
+ *   License along with FreeCAD. If not, see                                *
+ *   <https://www.gnu.org/licenses/>.                                       *
+ *                                                                          *
+ ***************************************************************************/
+
+#ifndef FREECAD_FIRSTSTARTWIDGET_H
+#define FREECAD_FIRSTSTARTWIDGET_H
+
+#include <QWidget>
+#include <QGroupBox>
+
+class QLabel;
+class QPushButton;
+
+namespace StartGui
+{
+
+class ThemeSelectorWidget;
+class GeneralSettingsWidget;
+
+class FirstStartWidget: public QGroupBox
+{
+    Q_OBJECT
+public:
+    explicit FirstStartWidget(QWidget* parent = nullptr);
+    bool eventFilter(QObject* object, QEvent* event) override;
+
+private:
+    void retranslateUi();
+    void setupUi();
+    void doneClicked();
+
+    ThemeSelectorWidget* _themeSelectorWidget;
+    GeneralSettingsWidget* _generalSettingsWidget;
+
+    QLabel* _welcomeLabel;
+    QLabel* _descriptionLabel;
+    QPushButton* _doneButton;
+};
+
+}  // namespace StartGui
+
+#endif  // FREECAD_FIRSTSTARTWIDGET_H
diff --git a/src/Mod/Start/Gui/GeneralSettingsWidget.cpp b/src/Mod/Start/Gui/GeneralSettingsWidget.cpp
new file mode 100644
index 0000000000..72da566fd1
--- /dev/null
+++ b/src/Mod/Start/Gui/GeneralSettingsWidget.cpp
@@ -0,0 +1,238 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/****************************************************************************
+ *                                                                          *
+ *   Copyright (c) 2024 The FreeCAD Project Association AISBL               *
+ *                                                                          *
+ *   This file is part of FreeCAD.                                          *
+ *                                                                          *
+ *   FreeCAD is free software: you can redistribute it and/or modify it     *
+ *   under the terms of the GNU Lesser General Public License as            *
+ *   published by the Free Software Foundation, either version 2.1 of the   *
+ *   License, or (at your option) any later version.                        *
+ *                                                                          *
+ *   FreeCAD is distributed in the hope that it will be useful, but         *
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of             *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU       *
+ *   Lesser General Public License for more details.                        *
+ *                                                                          *
+ *   You should have received a copy of the GNU Lesser General Public       *
+ *   License along with FreeCAD. If not, see                                *
+ *   <https://www.gnu.org/licenses/>.                                       *
+ *                                                                          *
+ ***************************************************************************/
+
+#include "PreCompiled.h"
+#ifndef _PreComp_
+#include <QApplication>
+#include <QComboBox>
+#include <QGridLayout>
+#include <QLabel>
+#include <QLayout>
+#include <QToolButton>
+#include <QVBoxLayout>
+#include <QWidget>
+#endif
+
+#include "GeneralSettingsWidget.h"
+#include <gsl/pointers>
+#include <App/Application.h>
+#include <Base/Parameter.h>
+#include <Base/UnitsApi.h>
+#include <Gui/Language/Translator.h>
+#include <Gui/NavigationStyle.h>
+
+using namespace StartGui;
+
+GeneralSettingsWidget::GeneralSettingsWidget(QWidget* parent)
+    : QWidget(parent)
+    , _languageLabel {nullptr}
+    , _unitSystemLabel {nullptr}
+    , _navigationStyleLabel {nullptr}
+    , _languageComboBox {nullptr}
+    , _unitSystemComboBox {nullptr}
+    , _navigationStyleComboBox {nullptr}
+{
+    setObjectName(QLatin1String("GeneralSettingsWidget"));
+    setupUi();
+    qApp->installEventFilter(this);
+}
+
+void GeneralSettingsWidget::setupUi()
+{
+    if (layout()) {
+        qDeleteAll(findChildren<QWidget*>(QString(), Qt::FindDirectChildrenOnly));
+        delete layout();
+    }
+    _languageLabel = gsl::owner<QLabel*>(new QLabel);
+    _navigationStyleLabel = gsl::owner<QLabel*>(new QLabel);
+    _unitSystemLabel = gsl::owner<QLabel*>(new QLabel);
+    createLanguageComboBox();
+    createUnitSystemComboBox();
+    createNavigationStyleComboBox();
+    createHorizontalUi();
+    retranslateUi();
+}
+
+void GeneralSettingsWidget::createHorizontalUi()
+{
+    auto mainLayout = gsl::owner<QHBoxLayout*>(new QHBoxLayout(this));
+    const int extraSpace {36};
+    mainLayout->addWidget(_languageLabel);
+    mainLayout->addWidget(_languageComboBox);
+    mainLayout->addSpacing(extraSpace);
+    mainLayout->addWidget(_unitSystemLabel);
+    mainLayout->addWidget(_unitSystemComboBox);
+    mainLayout->addSpacing(extraSpace);
+    mainLayout->addWidget(_navigationStyleLabel);
+    mainLayout->addWidget(_navigationStyleComboBox);
+}
+
+
+QString GeneralSettingsWidget::createLabelText(const QString& translatedText) const
+{
+    static const auto h2Start = QLatin1String("<h2>");
+    static const auto h2End = QLatin1String("</h2>");
+    return h2Start + translatedText + h2End;
+}
+
+gsl::owner<QComboBox*> GeneralSettingsWidget::createLanguageComboBox()
+{
+    ParameterGrp::handle hGrp =
+        App::GetApplication().GetParameterGroupByPath("User parameter:BaseApp/Preferences/General");
+    auto langToStr = Gui::Translator::instance()->activeLanguage();
+    QByteArray language = hGrp->GetASCII("Language", langToStr.c_str()).c_str();
+    auto comboBox = gsl::owner<QComboBox*>(new QComboBox);
+    comboBox->addItem(QString::fromLatin1("English"), QByteArray("English"));
+    Gui::TStringMap list = Gui::Translator::instance()->supportedLocales();
+    int index {0};
+    for (auto it = list.begin(); it != list.end(); ++it, ++index) {
+        QByteArray lang = it->first.c_str();
+        QString langname = QString::fromLatin1(lang.constData());
+
+        if (it->second == "sr-CS") {
+            // Qt does not treat sr-CS (Serbian, Latin) as a Latin-script variant by default: this
+            // forces it to do so.
+            it->second = "sr_Latn";
+        }
+
+        QLocale locale(QString::fromLatin1(it->second.c_str()));
+        QString native = locale.nativeLanguageName();
+        if (!native.isEmpty()) {
+            if (native[0].isLetter()) {
+                native[0] = native[0].toUpper();
+            }
+            langname = native;
+        }
+
+        comboBox->addItem(langname, lang);
+        if (language == lang) {
+            comboBox->setCurrentIndex(index);
+        }
+    }
+    _languageComboBox = comboBox;
+    connect(_languageComboBox,
+            qOverload<int>(&QComboBox::currentIndexChanged),
+            this,
+            &GeneralSettingsWidget::onLanguageChanged);
+    return comboBox;
+}
+
+gsl::owner<QComboBox*> GeneralSettingsWidget::createUnitSystemComboBox()
+{
+    // Contents are created in retranslateUi()
+    auto comboBox = gsl::owner<QComboBox*>(new QComboBox);
+    _unitSystemComboBox = comboBox;
+    connect(_unitSystemComboBox,
+            qOverload<int>(&QComboBox::currentIndexChanged),
+            this,
+            &GeneralSettingsWidget::onUnitSystemChanged);
+    return comboBox;
+}
+
+gsl::owner<QComboBox*> GeneralSettingsWidget::createNavigationStyleComboBox()
+{
+    // Contents are created in retranslateUi()
+    auto comboBox = gsl::owner<QComboBox*>(new QComboBox);
+    _navigationStyleComboBox = comboBox;
+    connect(_navigationStyleComboBox,
+            qOverload<int>(&QComboBox::currentIndexChanged),
+            this,
+            &GeneralSettingsWidget::onNavigationStyleChanged);
+    return comboBox;
+}
+
+void GeneralSettingsWidget::onLanguageChanged(int index)
+{
+    if (index < 0) {
+        return;  // happens when clearing the combo box in retranslateUi()
+    }
+    Gui::Translator::instance()->activateLanguage(
+        _languageComboBox->itemData(index).toByteArray().data());
+    ParameterGrp::handle hGrp =
+        App::GetApplication().GetParameterGroupByPath("User parameter:BaseApp/Preferences/General");
+    auto langToStr = Gui::Translator::instance()->activeLanguage();
+    hGrp->SetASCII("Language", langToStr.c_str());
+}
+
+void GeneralSettingsWidget::onUnitSystemChanged(int index)
+{
+    if (index < 0) {
+        return;  // happens when clearing the combo box in retranslateUi()
+    }
+    Base::UnitsApi::setSchema(static_cast<Base::UnitSystem>(index));
+    ParameterGrp::handle hGrp =
+        App::GetApplication().GetParameterGroupByPath("User parameter:BaseApp/Preferences/Units");
+    hGrp->SetInt("UserSchema", index);
+}
+
+void GeneralSettingsWidget::onNavigationStyleChanged(int index)
+{
+    if (index < 0) {
+        return;  // happens when clearing the combo box in retranslateUi()
+    }
+    auto navStyleName = _navigationStyleComboBox->itemData(index).toByteArray().data();
+    ParameterGrp::handle hGrp =
+        App::GetApplication().GetParameterGroupByPath("User parameter:BaseApp/Preferences/View");
+    hGrp->SetASCII("NavigationStyle", navStyleName);
+}
+
+bool GeneralSettingsWidget::eventFilter(QObject* object, QEvent* event)
+{
+    if (object == this && event->type() == QEvent::LanguageChange) {
+        this->retranslateUi();
+    }
+    return QWidget::eventFilter(object, event);
+}
+
+void GeneralSettingsWidget::retranslateUi()
+{
+    _languageLabel->setText(createLabelText(tr("Language")));
+    _unitSystemLabel->setText(createLabelText(tr("Unit System")));
+
+    _unitSystemComboBox->clear();
+    ParameterGrp::handle hGrpUnits =
+        App::GetApplication().GetParameterGroupByPath("User parameter:BaseApp/Preferences/Units");
+    auto userSchema = hGrpUnits->GetInt("UserSchema", 0);
+    int num = static_cast<int>(Base::UnitSystem::NumUnitSystemTypes);
+    for (int i = 0; i < num; i++) {
+        QString item = Base::UnitsApi::getDescription(static_cast<Base::UnitSystem>(i));
+        _unitSystemComboBox->addItem(item, i);
+    }
+    _unitSystemComboBox->setCurrentIndex(userSchema);
+
+    _navigationStyleLabel->setText(createLabelText(tr("Navigation Style")));
+    _navigationStyleComboBox->clear();
+    ParameterGrp::handle hGrpNav =
+        App::GetApplication().GetParameterGroupByPath("User parameter:BaseApp/Preferences/View");
+    auto navStyleName =
+        hGrpNav->GetASCII("NavigationStyle", Gui::CADNavigationStyle::getClassTypeId().getName());
+    std::map<Base::Type, std::string> styles = Gui::UserNavigationStyle::getUserFriendlyNames();
+    for (const auto& style : styles) {
+        QByteArray data(style.first.getName());
+        QString name = QApplication::translate(style.first.getName(), style.second.c_str());
+        _navigationStyleComboBox->addItem(name, data);
+        if (navStyleName == style.first.getName()) {
+            _navigationStyleComboBox->setCurrentIndex(_navigationStyleComboBox->count() - 1);
+        }
+    }
+}
diff --git a/src/Mod/Start/Gui/GeneralSettingsWidget.h b/src/Mod/Start/Gui/GeneralSettingsWidget.h
new file mode 100644
index 0000000000..79aa0dea54
--- /dev/null
+++ b/src/Mod/Start/Gui/GeneralSettingsWidget.h
@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/****************************************************************************
+ *                                                                          *
+ *   Copyright (c) 2024 The FreeCAD Project Association AISBL               *
+ *                                                                          *
+ *   This file is part of FreeCAD.                                          *
+ *                                                                          *
+ *   FreeCAD is free software: you can redistribute it and/or modify it     *
+ *   under the terms of the GNU Lesser General Public License as            *
+ *   published by the Free Software Foundation, either version 2.1 of the   *
+ *   License, or (at your option) any later version.                        *
+ *                                                                          *
+ *   FreeCAD is distributed in the hope that it will be useful, but         *
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of             *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU       *
+ *   Lesser General Public License for more details.                        *
+ *                                                                          *
+ *   You should have received a copy of the GNU Lesser General Public       *
+ *   License along with FreeCAD. If not, see                                *
+ *   <https://www.gnu.org/licenses/>.                                       *
+ *                                                                          *
+ ***************************************************************************/
+
+#ifndef FREECAD_START_GENERALSETTINGSWIDGET_H
+#define FREECAD_START_GENERALSETTINGSWIDGET_H
+
+#include <QWidget>
+#include <3rdParty/GSL/include/gsl/pointers>
+
+class QLabel;
+class QComboBox;
+
+namespace StartGui
+{
+
+class GeneralSettingsWidget: public QWidget
+{
+    Q_OBJECT
+public:
+    explicit GeneralSettingsWidget(QWidget* parent = nullptr);
+
+    bool eventFilter(QObject* object, QEvent* event) override;
+
+private:
+    void retranslateUi();
+
+    void setupUi();
+    void createHorizontalUi();
+
+    QString createLabelText(const QString& translatedText) const;
+    gsl::owner<QComboBox*> createLanguageComboBox();
+    gsl::owner<QComboBox*> createUnitSystemComboBox();
+    gsl::owner<QComboBox*> createNavigationStyleComboBox();
+
+    void onLanguageChanged(int index);
+    void onUnitSystemChanged(int index);
+    void onNavigationStyleChanged(int index);
+
+    Qt::Orientation _orientation;
+
+    // Non-owning pointers to things that need to be re-translated when the language changes
+    QLabel* _languageLabel;
+    QLabel* _unitSystemLabel;
+    QLabel* _navigationStyleLabel;
+    QComboBox* _languageComboBox;
+    QComboBox* _unitSystemComboBox;
+    QComboBox* _navigationStyleComboBox;
+};
+
+}  // namespace StartGui
+
+#endif  // FREECAD_START_GENERALSETTINGSWIDGET_H
diff --git a/src/Mod/Start/Gui/PreCompiled.h b/src/Mod/Start/Gui/PreCompiled.h
index 11cc15a39d..86c1f0884f 100644
--- a/src/Mod/Start/Gui/PreCompiled.h
+++ b/src/Mod/Start/Gui/PreCompiled.h
@@ -44,22 +44,28 @@
 
 // Qt
 #include <QApplication>
+#include <QBoxLayout>
 #include <QCheckBox>
+#include <QComboBox>
+#include <QCoreApplication>
 #include <QFile>
 #include <QFileIconProvider>
 #include <QGridLayout>
 #include <QGuiApplication>
+#include <QHBoxLayout>
 #include <QImageReader>
 #include <QLabel>
 #include <QListView>
 #include <QModelIndex>
 #include <QPainter>
 #include <QPushButton>
+#include <QResizeEvent>
 #include <QScrollArea>
 #include <QSpacerItem>
 #include <QString>
 #include <QStyleOptionViewItem>
 #include <QTimer>
+#include <QToolButton>
 #include <QUrl>
 #include <QVBoxLayout>
 #include <QWidget>
diff --git a/src/Mod/Start/Gui/Resources/Start.qrc b/src/Mod/Start/Gui/Resources/Start.qrc
index 0104840591..bb09223edc 100644
--- a/src/Mod/Start/Gui/Resources/Start.qrc
+++ b/src/Mod/Start/Gui/Resources/Start.qrc
@@ -2,5 +2,8 @@
     <qresource prefix="/">
         <file>icons/StartCommandIcon.svg</file>
         <file>icons/PartDesignWorkbench.svg</file>
+        <file>thumbnails/Classic512.png</file>
+        <file>thumbnails/OpenLight512.png</file>
+        <file>thumbnails/OpenDark512.png</file>
     </qresource>
 </RCC>
diff --git a/src/Mod/Start/Gui/Resources/thumbnails/Classic512.png b/src/Mod/Start/Gui/Resources/thumbnails/Classic512.png
new file mode 100644
index 0000000000..367c5159da
Binary files /dev/null and b/src/Mod/Start/Gui/Resources/thumbnails/Classic512.png differ
diff --git a/src/Mod/Start/Gui/Resources/thumbnails/OpenDark512.png b/src/Mod/Start/Gui/Resources/thumbnails/OpenDark512.png
new file mode 100644
index 0000000000..3dfef600a2
Binary files /dev/null and b/src/Mod/Start/Gui/Resources/thumbnails/OpenDark512.png differ
diff --git a/src/Mod/Start/Gui/Resources/thumbnails/OpenLight512.png b/src/Mod/Start/Gui/Resources/thumbnails/OpenLight512.png
new file mode 100644
index 0000000000..9d659d267c
Binary files /dev/null and b/src/Mod/Start/Gui/Resources/thumbnails/OpenLight512.png differ
diff --git a/src/Mod/Start/Gui/StartView.cpp b/src/Mod/Start/Gui/StartView.cpp
index ed2d0f48b1..7adeda064c 100644
--- a/src/Mod/Start/Gui/StartView.cpp
+++ b/src/Mod/Start/Gui/StartView.cpp
@@ -37,6 +37,7 @@
 #include "StartView.h"
 #include "FileCardDelegate.h"
 #include "FileCardView.h"
+#include "FirstStartWidget.h"
 #include "FlowLayout.h"
 #include "Gui/Workbench.h"
 #include <Gui/Document.h>
@@ -99,6 +100,11 @@ gsl::owner<QPushButton*> createNewButton(const NewButton& newButton)
 StartView::StartView(Gui::Document* pcDocument, QWidget* parent)
     : Gui::MDIView(pcDocument, parent)
     , _contents(new QScrollArea(parent))
+    , _newFileLabel {nullptr}
+    , _examplesLabel {nullptr}
+    , _recentFilesLabel {nullptr}
+    , _showOnStartupCheckBox {nullptr}
+    , _rewriteLabel {nullptr}
 {
     setObjectName(QLatin1String("StartView"));
     auto hGrp = App::GetApplication().GetParameterGroupByPath(
@@ -114,44 +120,42 @@ StartView::StartView(Gui::Document* pcDocument, QWidget* parent)
     layout->setSizeConstraint(QLayout::SizeConstraint::SetMinAndMaxSize);
 
     // New WB notice: temporary to explain why all your setting disappeared
-    auto newStartWBNotice = gsl::owner<QLabel*>(
-        new QLabel(tr("NOTE: The Start Workbench has been completely rewritten to remove all "
-                      "network access, and to remove its dependency on Chromium. This is still a "
-                      "work-in-progress, and not all settings from the previous version of Start "
-                      "have been migrated yet.")));
-    newStartWBNotice->setWordWrap(true);
-    layout->addWidget(newStartWBNotice);
+    _rewriteLabel = gsl::owner<QLabel*>(new QLabel());
+    _rewriteLabel->setWordWrap(true);
+    layout->addWidget(_rewriteLabel);
 
     // Launch start automatically?
-    QString application = QString::fromUtf8(App::Application::Config()["ExeName"].c_str());
-    auto launchAutomaticallyCheckbox =
-        gsl::owner<QCheckBox*>(new QCheckBox(tr("Show Start when starting %1").arg(application)));
+    _showOnStartupCheckBox = gsl::owner<QCheckBox*>(new QCheckBox());
     bool showOnStartup = hGrp->GetBool("ShowOnStartup", true);
-    launchAutomaticallyCheckbox->setCheckState(showOnStartup ? Qt::CheckState::Checked
-                                                             : Qt::CheckState::Unchecked);
-    connect(launchAutomaticallyCheckbox,
-            &QCheckBox::toggled,
-            this,
-            &StartView::showOnStartupChanged);
-    layout->addWidget(launchAutomaticallyCheckbox);
+    _showOnStartupCheckBox->setCheckState(showOnStartup ? Qt::CheckState::Checked
+                                                        : Qt::CheckState::Unchecked);
+    connect(_showOnStartupCheckBox, &QCheckBox::toggled, this, &StartView::showOnStartupChanged);
+    layout->addWidget(_showOnStartupCheckBox);
 
-    const QLatin1String h1Start("<h1>");
-    const QLatin1String h1End("</h1>");
+    auto firstStart = hGrp->GetBool("FirstStart2024", true);  // NOLINT
+    if (firstStart) {
+        auto firstStartRegion = gsl::owner<QHBoxLayout*>(new QHBoxLayout);
+        firstStartRegion->addStretch();
+        auto firstStartWidget = gsl::owner<FirstStartWidget*>(new FirstStartWidget(this));
+        firstStartRegion->addWidget(firstStartWidget);
+        firstStartRegion->addStretch();
+        layout->addLayout(firstStartRegion);
+    }
 
-    auto newFileLabel = gsl::owner<QLabel*>(new QLabel(h1Start + tr("New File") + h1End));
-    layout->addWidget(newFileLabel);
+    _newFileLabel = gsl::owner<QLabel*>(new QLabel());
+    layout->addWidget(_newFileLabel);
     auto flowLayout = gsl::owner<FlowLayout*>(new FlowLayout);
     layout->addLayout(flowLayout);
     configureNewFileButtons(flowLayout);
 
-    auto recentFilesLabel = gsl::owner<QLabel*>(new QLabel(h1Start + tr("Recent Files") + h1End));
-    layout->addWidget(recentFilesLabel);
+    _recentFilesLabel = gsl::owner<QLabel*>(new QLabel());
+    layout->addWidget(_recentFilesLabel);
     auto recentFilesListWidget = gsl::owner<FileCardView*>(new FileCardView(_contents));
     connect(recentFilesListWidget, &QListView::clicked, this, &StartView::fileCardSelected);
     layout->addWidget(recentFilesListWidget);
 
-    auto examplesLabel = gsl::owner<QLabel*>(new QLabel(h1Start + tr("Examples") + h1End));
-    layout->addWidget(examplesLabel);
+    _examplesLabel = gsl::owner<QLabel*>(new QLabel());
+    layout->addWidget(_examplesLabel);
     auto examplesListWidget = gsl::owner<FileCardView*>(new FileCardView(_contents));
     connect(examplesListWidget, &QListView::clicked, this, &StartView::fileCardSelected);
     layout->addWidget(examplesListWidget);
@@ -161,11 +165,10 @@ StartView::StartView(Gui::Document* pcDocument, QWidget* parent)
 
     setCentralWidget(_contents);
 
-    QString title = QCoreApplication::translate("Workbench", "Start");
-    setWindowTitle(title);
-
     configureExamplesListWidget(examplesListWidget);
-    configureRecentFilesListWidget(recentFilesListWidget, recentFilesLabel);
+    configureRecentFilesListWidget(recentFilesListWidget, _recentFilesLabel);
+
+    retranslateUi();
 }
 
 void StartView::configureNewFileButtons(QLayout* layout) const
@@ -202,7 +205,6 @@ void StartView::configureNewFileButtons(QLayout* layout) const
     }
 
     // TODO: Ensure all of the required WBs are actually available
-    // TODO: Make this layout more flexible (e.g. use a single line if possible)
     layout->addWidget(partDesign);
     layout->addWidget(assembly);
     layout->addWidget(draft);
@@ -406,3 +408,33 @@ void StartView::showOnStartupChanged(bool checked)
         "User parameter:BaseApp/Preferences/Mod/Start");
     hGrp->SetBool("ShowOnStartup", checked);
 }
+
+void StartView::changeEvent(QEvent* event)
+{
+    if (event->type() == QEvent::LanguageChange) {
+        this->retranslateUi();
+    }
+    Gui::MDIView::changeEvent(event);
+}
+
+void StartView::retranslateUi()
+{
+    QString title = QCoreApplication::translate("Workbench", "Start");
+    setWindowTitle(title);
+
+    const QLatin1String h1Start("<h1>");
+    const QLatin1String h1End("</h1>");
+
+    _newFileLabel->setText(h1Start + tr("New File") + h1End);
+    _examplesLabel->setText(h1Start + tr("Examples") + h1End);
+    _recentFilesLabel->setText(h1Start + tr("Recent Files") + h1End);
+
+    QString application = QString::fromUtf8(App::Application::Config()["ExeName"].c_str());
+    _showOnStartupCheckBox->setText(tr("Show this view when starting %1").arg(application));
+
+    _rewriteLabel->setText(
+        tr("NOTE: The Start Workbench has been completely rewritten to remove all "
+           "network access, and to remove its dependency on Chromium. This is still a "
+           "work-in-progress, and not all settings from the previous version of Start "
+           "have been migrated yet."));
+}
diff --git a/src/Mod/Start/Gui/StartView.h b/src/Mod/Start/Gui/StartView.h
index 8f9439c2ad..4ff41f7cf0 100644
--- a/src/Mod/Start/Gui/StartView.h
+++ b/src/Mod/Start/Gui/StartView.h
@@ -32,10 +32,11 @@
 #include "../App/RecentFilesModel.h"
 #include "../App/ExamplesModel.h"
 
-
+class QCheckBox;
+class QEvent;
+class QGridLayout;
 class QLabel;
 class QListView;
-class QGridLayout;
 class QScrollArea;
 
 namespace Gui
@@ -75,6 +76,8 @@ public:
     };
 
 protected:
+    void changeEvent(QEvent* e) override;
+
     void configureNewFileButtons(QLayout* layout) const;
     static void configureFileCardWidget(QListView* fileCardWidget);
     void configureRecentFilesListWidget(QListView* recentFilesListWidget, QLabel* recentFilesLabel);
@@ -88,10 +91,18 @@ protected:
     QString fileCardStyle() const;
 
 private:
+    void retranslateUi();
+
     QScrollArea* _contents = nullptr;
     Start::RecentFilesModel _recentFilesModel;
     Start::ExamplesModel _examplesModel;
 
+    QLabel* _newFileLabel;
+    QLabel* _examplesLabel;
+    QLabel* _recentFilesLabel;
+    QCheckBox* _showOnStartupCheckBox;
+    QLabel* _rewriteLabel;
+
 
 };  // namespace StartGui
 
diff --git a/src/Mod/Start/Gui/ThemeSelectorWidget.cpp b/src/Mod/Start/Gui/ThemeSelectorWidget.cpp
new file mode 100644
index 0000000000..7226659a9e
--- /dev/null
+++ b/src/Mod/Start/Gui/ThemeSelectorWidget.cpp
@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/****************************************************************************
+ *                                                                          *
+ *   Copyright (c) 2024 The FreeCAD Project Association AISBL               *
+ *                                                                          *
+ *   This file is part of FreeCAD.                                          *
+ *                                                                          *
+ *   FreeCAD is free software: you can redistribute it and/or modify it     *
+ *   under the terms of the GNU Lesser General Public License as            *
+ *   published by the Free Software Foundation, either version 2.1 of the   *
+ *   License, or (at your option) any later version.                        *
+ *                                                                          *
+ *   FreeCAD is distributed in the hope that it will be useful, but         *
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of             *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU       *
+ *   Lesser General Public License for more details.                        *
+ *                                                                          *
+ *   You should have received a copy of the GNU Lesser General Public       *
+ *   License along with FreeCAD. If not, see                                *
+ *   <https://www.gnu.org/licenses/>.                                       *
+ *                                                                          *
+ ***************************************************************************/
+
+#include "PreCompiled.h"
+#ifndef _PreComp_
+#include <QGuiApplication>
+#include <QHBoxLayout>
+#include <QLabel>
+#include <QString>
+#include <QToolButton>
+#endif
+
+#include "ThemeSelectorWidget.h"
+#include <3rdParty/GSL/include/gsl/pointers>
+#include <App/Application.h>
+#include <Gui/Application.h>
+#include <Gui/PreferencePackManager.h>
+
+using namespace StartGui;
+
+ThemeSelectorWidget::ThemeSelectorWidget(QWidget* parent)
+    : QWidget(parent)
+    , _titleLabel {nullptr}
+    , _descriptionLabel {nullptr}
+    , _buttons {nullptr, nullptr, nullptr}
+{
+    setObjectName(QLatin1String("ThemeSelectorWidget"));
+    setupUi();
+    qApp->installEventFilter(this);
+}
+
+
+void ThemeSelectorWidget::setupButtons(QBoxLayout* layout)
+{
+    if (!layout) {
+        return;
+    }
+    std::map<Theme, QString> themeMap {{Theme::Classic, tr("Classic")},
+                                       {Theme::Light, tr("Light")},
+                                       {Theme::Dark, tr("Dark")}};
+    std::map<Theme, QIcon> iconMap {
+        {Theme::Classic, QIcon(QLatin1String(":/thumbnails/Classic512.png"))},
+        {Theme::Light, QIcon(QLatin1String(":/thumbnails/OpenLight512.png"))},
+        {Theme::Dark, QIcon(QLatin1String(":/thumbnails/OpenDark512.png"))}};
+    auto hGrp = App::GetApplication().GetParameterGroupByPath(
+        "User parameter:BaseApp/Preferences/MainWindow");
+    auto styleSheetName = QString::fromStdString(hGrp->GetASCII("StyleSheet"));
+    for (const auto& theme : themeMap) {
+        auto button = gsl::owner<QToolButton*>(new QToolButton());
+        button->setCheckable(true);
+        button->setAutoExclusive(true);
+        button->setToolButtonStyle(Qt::ToolButtonStyle::ToolButtonTextUnderIcon);
+        button->setText(theme.second);
+        button->setIcon(iconMap[theme.first]);
+        button->setIconSize(iconMap[theme.first].actualSize(QSize(256, 256)));
+        if (theme.first == Theme::Classic && styleSheetName.isEmpty()) {
+            button->setChecked(true);
+        }
+        else if (theme.first == Theme::Light
+                 && styleSheetName.contains(QLatin1String("light"),
+                                            Qt::CaseSensitivity::CaseInsensitive)) {
+            button->setChecked(true);
+        }
+        else if (theme.first == Theme::Dark
+                 && styleSheetName.contains(QLatin1String("dark"),
+                                            Qt::CaseSensitivity::CaseInsensitive)) {
+            button->setChecked(true);
+        }
+        connect(button, &QToolButton::clicked, this, [this, theme] {
+            themeChanged(theme.first);
+        });
+        layout->addWidget(button);
+        _buttons[static_cast<int>(theme.first)] = button;
+    }
+}
+
+void ThemeSelectorWidget::setupUi()
+{
+    auto* outerLayout = gsl::owner<QVBoxLayout*>(new QVBoxLayout(this));
+    auto* buttonLayout = gsl::owner<QHBoxLayout*>(new QHBoxLayout);
+    _titleLabel = gsl::owner<QLabel*>(new QLabel);
+    _descriptionLabel = gsl::owner<QLabel*>(new QLabel);
+    outerLayout->addWidget(_titleLabel);
+    outerLayout->addWidget(_descriptionLabel);
+    outerLayout->addLayout(buttonLayout);
+    setupButtons(buttonLayout);
+    retranslateUi();
+}
+
+void ThemeSelectorWidget::themeChanged(Theme newTheme)
+{
+    // Run the appropriate preference pack:
+    auto prefPackManager = Gui::Application::Instance->prefPackManager();
+    switch (newTheme) {
+        case Theme::Classic:
+            prefPackManager->apply("Classic");
+            break;
+        case Theme::Dark:
+            prefPackManager->apply("Dark");
+            break;
+        case Theme::Light:
+            prefPackManager->apply("Light");
+            break;
+    }
+}
+
+bool ThemeSelectorWidget::eventFilter(QObject* object, QEvent* event)
+{
+    if (object == this && event->type() == QEvent::LanguageChange) {
+        this->retranslateUi();
+    }
+    return QWidget::eventFilter(object, event);
+}
+
+void ThemeSelectorWidget::retranslateUi()
+{
+    _titleLabel->setText(QLatin1String("<h2>") + tr("Theme") + QLatin1String("</h2>"));
+    _descriptionLabel->setText(tr("More themes are available online using the Addon Manager"));
+    _buttons[static_cast<int>(Theme::Classic)]->setText(tr("Classic", "Visual theme name"));
+    _buttons[static_cast<int>(Theme::Light)]->setText(tr("Light", "Visual theme name"));
+    _buttons[static_cast<int>(Theme::Dark)]->setText(tr("Dark", "Visual theme name"));
+}
diff --git a/src/Mod/Start/Gui/ThemeSelectorWidget.h b/src/Mod/Start/Gui/ThemeSelectorWidget.h
new file mode 100644
index 0000000000..f7d079f7ae
--- /dev/null
+++ b/src/Mod/Start/Gui/ThemeSelectorWidget.h
@@ -0,0 +1,67 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/****************************************************************************
+ *                                                                          *
+ *   Copyright (c) 2024 The FreeCAD Project Association AISBL               *
+ *                                                                          *
+ *   This file is part of FreeCAD.                                          *
+ *                                                                          *
+ *   FreeCAD is free software: you can redistribute it and/or modify it     *
+ *   under the terms of the GNU Lesser General Public License as            *
+ *   published by the Free Software Foundation, either version 2.1 of the   *
+ *   License, or (at your option) any later version.                        *
+ *                                                                          *
+ *   FreeCAD is distributed in the hope that it will be useful, but         *
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of             *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU       *
+ *   Lesser General Public License for more details.                        *
+ *                                                                          *
+ *   You should have received a copy of the GNU Lesser General Public       *
+ *   License along with FreeCAD. If not, see                                *
+ *   <https://www.gnu.org/licenses/>.                                       *
+ *                                                                          *
+ ***************************************************************************/
+
+#ifndef FREECAD_START_THEMESELECTORWIDGET_H
+#define FREECAD_START_THEMESELECTORWIDGET_H
+
+#include <QWidget>
+#include <array>
+
+class QBoxLayout;
+class QLabel;
+class QToolButton;
+
+namespace StartGui
+{
+
+enum class Theme
+{
+    Classic,
+    Light,
+    Dark
+};
+
+/// A widget to allow selection of the UI theme (color scheme).
+class ThemeSelectorWidget: public QWidget
+{
+    Q_OBJECT
+public:
+    explicit ThemeSelectorWidget(QWidget* parent = nullptr);
+    bool eventFilter(QObject* object, QEvent* event) override;
+
+protected:
+    void themeChanged(Theme newTheme);
+
+private:
+    void retranslateUi();
+    void setupUi();
+    void setupButtons(QBoxLayout* layout);
+
+    QLabel* _titleLabel;
+    QLabel* _descriptionLabel;
+    std::array<QToolButton*, 3> _buttons;
+};
+
+}  // namespace StartGui
+
+#endif  // FREECAD_START_THEMESELECTORWIDGET_H
diff --git a/tests/src/Mod/Sketcher/App/planegcs/Constraints.cpp b/tests/src/Mod/Sketcher/App/planegcs/Constraints.cpp
index 105cb20df5..e113732b86 100644
--- a/tests/src/Mod/Sketcher/App/planegcs/Constraints.cpp
+++ b/tests/src/Mod/Sketcher/App/planegcs/Constraints.cpp
@@ -1,8 +1,5 @@
 // SPDX-License-Identifier: LGPL-2.1-or-later
 
-#ifdef WIN32
-#define _USE_MATH_DEFINES
-#endif
 #include <cmath>
 
 #include "gtest/gtest.h"