Display grouped data in Collection View in .NET MAUI / Xamarin

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Setting Application Theme Manually In .Net MAUI

 Write Following code on App.xaml.cs

namespace CustomRenderer;
 
public partial class App : Application
{
	public App()
	{
		InitializeComponent();
                Application.Current.UserAppTheme = AppTheme.Light;
                MainPage = new AppShell();
	}
}