LanMountainDesktop/LanMountainDesktop/Views/SettingsPages/AboutSettingsPage.axaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:ui="using:FluentAvalonia.UI.Controls"
             xmlns:fi="using:FluentIcons.Avalonia.Fluent"
             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="1000"
             x:Class="LanMountainDesktop.Views.SettingsPages.AboutSettingsPage">

    <StackPanel x:Name="AboutSettingsPanel" Spacing="20">
        <TextBlock x:Name="AboutPanelTitleTextBlock" FontSize="24" FontWeight="SemiBold" Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" Text="About" />
        
        <Border Background="{DynamicResource AdaptiveSurfaceRaisedBrush}" CornerRadius="{DynamicResource DesignCornerRadiusMd}" Padding="20">
            <StackPanel Spacing="12">
                <TextBlock Text="LanMountainDesktop" FontSize="20" FontWeight="SemiBold" Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
                <TextBlock Text="Modern desktop shell experience." FontSize="13" Foreground="{DynamicResource AdaptiveTextSecondaryBrush}" />
                <Separator Background="{DynamicResource AdaptiveButtonBorderBrush}" Margin="0,8" />
                <TextBlock x:Name="VersionTextBlock" Text="Version: 1.0.0" FontSize="13" Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
                <TextBlock x:Name="CodeNameTextBlock" Text="Code Name: Administrate" FontSize="13" FontWeight="SemiBold" Foreground="{DynamicResource AdaptiveAccentBrush}" />
                <TextBlock x:Name="FontInfoTextBlock" Text="Font: MiSans" FontSize="12" Foreground="{DynamicResource AdaptiveTextSecondaryBrush}" />
            </StackPanel>
        </Border>

        <Border Classes="settings-expander-shell">
            <ui:SettingsExpander x:Name="AboutStartupSettingsExpander"
                                 Header="Windows Startup"
                                 Description="Launch the app automatically when signing in to Windows."
                                 IsExpanded="True">
                <ui:SettingsExpander.IconSource>
                    <fi:SymbolIconSource Symbol="Window" />
                </ui:SettingsExpander.IconSource>
                <ui:SettingsExpander.Footer>
                    <ToggleSwitch x:Name="AutoStartWithWindowsToggleSwitch" />
                </ui:SettingsExpander.Footer>
            </ui:SettingsExpander>
        </Border>

        <Border Classes="settings-expander-shell">
            <ui:SettingsExpander x:Name="AboutRenderModeSettingsExpander"
                                 Header="Rendering Mode"
                                 Description="Choose the rendering backend. Restart the app after changing this option. Unsupported modes fall back to software."
                                 IsExpanded="True">
                <ui:SettingsExpander.IconSource>
                    <fi:SymbolIconSource Symbol="Window" />
                </ui:SettingsExpander.IconSource>
                <StackPanel Spacing="4"
                            Margin="0,4,0,0">
                    <TextBlock x:Name="CurrentRenderBackendLabelTextBlock"
                               Text="Current actual backend"
                               FontSize="12"
                               FontWeight="SemiBold"
                               Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
                    <TextBlock x:Name="CurrentRenderBackendValueTextBlock"
                               Text="Current backend: Software"
                               FontSize="13"
                               TextWrapping="Wrap"
                               Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
                    <TextBlock x:Name="CurrentRenderBackendImplementationTextBlock"
                               Text="Runtime implementation is unavailable."
                               FontSize="12"
                               TextWrapping="Wrap"
                               Foreground="{DynamicResource AdaptiveTextSecondaryBrush}" />
                </StackPanel>
                <ui:SettingsExpander.Footer>
                    <ComboBox x:Name="AppRenderModeComboBox"
                              MinWidth="180"
                              SelectedIndex="0"
                              HorizontalAlignment="Right">
                        <ComboBoxItem Content="Default" Tag="Default" />
                        <ComboBoxItem Content="Software" Tag="Software" />
                        <ComboBoxItem Content="angleEgl" Tag="AngleEgl" />
                        <ComboBoxItem Content="WGL" Tag="Wgl" />
                        <ComboBoxItem Content="Vulkan" Tag="Vulkan" />
                    </ComboBox>
                </ui:SettingsExpander.Footer>
            </ui:SettingsExpander>
        </Border>
    </StackPanel>
</UserControl>