Avalonia/samples/ControlCatalog/Pages/ContentPage/ContentPageFirstLookPage.xaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             x:Class="ControlCatalog.Pages.ContentPageFirstLookPage">
  <DockPanel>
    <ScrollViewer DockPanel.Dock="Right" Width="260">
      <StackPanel Margin="12" Spacing="8">
        <TextBlock Text="Configuration" FontWeight="SemiBold" FontSize="16"
                   Foreground="{DynamicResource SystemControlHighlightAccentBrush}" />
        <TextBlock Text="ContentPage is the fundamental page type. It hosts a single piece of content and integrates with NavigationPage, TabbedPage, and CarouselPage. The Header property sets the navigation bar title."
                   FontSize="12" Opacity="0.7" TextWrapping="Wrap" />

        <Separator />

        <TextBlock Text="Navigation" FontWeight="SemiBold" />
        <Button Content="Push Page" HorizontalAlignment="Stretch" Click="OnPush" />
        <Button Content="Pop Page" HorizontalAlignment="Stretch" Click="OnPop" />
        <Button Content="Pop to Root" HorizontalAlignment="Stretch" Click="OnPopToRoot" />

        <Separator />

        <TextBlock Text="Key Properties" FontWeight="SemiBold" />
        <TextBlock Text="• Header: nav bar title (string or Control)" FontSize="12" Opacity="0.8" TextWrapping="Wrap" />
        <TextBlock Text="• Content: any Avalonia control" FontSize="12" Opacity="0.8" TextWrapping="Wrap" />
        <TextBlock Text="• Background: page background brush" FontSize="12" Opacity="0.8" TextWrapping="Wrap" />
        <TextBlock Text="• HorizontalContentAlignment" FontSize="12" Opacity="0.8" />
        <TextBlock Text="• VerticalContentAlignment" FontSize="12" Opacity="0.8" />
        <TextBlock Text="• AutomaticallyApplySafeAreaPadding" FontSize="12" Opacity="0.8" />

        <Separator />

        <TextBlock x:Name="StatusText"
                   Text="Depth: 1 | Current: Root Page"
                   FontSize="11"
                   Opacity="0.7" />
      </StackPanel>
    </ScrollViewer>

    <Border DockPanel.Dock="Right" Width="1" Background="{DynamicResource SystemControlForegroundBaseMediumLowBrush}" />

    <Border Margin="12"
            BorderBrush="{DynamicResource SystemControlForegroundBaseMediumLowBrush}"
            BorderThickness="1"
            CornerRadius="6"
            ClipToBounds="True">
      <NavigationPage x:Name="DemoNav" />
    </Border>
  </DockPanel>
</UserControl>