FluentAvalonia/samples/FluentAvaloniaSamples/Program.cs

using Avalonia;
using FluentAvalonia.UI.Windowing;

namespace FluentAvaloniaSamples;

class Program
{
    // Initialization code. Don't use any Avalonia, third-party APIs or any
    // SynchronizationContext-reliant code before AppMain is called: things aren't initialized
    // yet and stuff might break.
    public static void Main(string[] args) => BuildAvaloniaApp()
        .StartWithClassicDesktopLifetime(args);

    // Avalonia configuration, don't remove; also used by visual designer.
    public static AppBuilder BuildAvaloniaApp()
        => AppBuilder.Configure<App>()
            .UsePlatformDetect()
            .LogToTrace()
            .With(new Win32PlatformOptions()
            {
                UseWindowsUIComposition = true,
                CompositionBackdropCornerRadius = 8f
            });
}