.NET MAUI - TwoPaneView
This sample demonstrates the different properties of the TwoPaneView layout control and how they affect its child views. TwoPaneView adapts to foldable and dual-screen Android devices (like Surface Duo) - on all other platforms it behaves as a proportional splitview layout.
For more information, see the .NET MAUI TwoPaneView page.
Most details from the old Xamarin TwoPaneView control still apply.