When I started my solution in VS Community 2019 it said that the Xamarin Forms Shell did not support UWP. I just upgraded VS to 16.9.2 and it now says UWP is a "Preview feature."
So I have a partially-completed Solution with Android and iOS projects. How do I add a UWP project to the existing mostly-completed solution? I try Solution->Add->Project and it seems to want to start a whole new app.
Does VS Community 2019 support Xamarin Forms Shell UWP?
Currently, Visual Studio has not provide complete project template for Xamarin Forms Shell for UWP platform, and derive from Xamarin Shell document.
Xamarin.Forms Shell is fully available on iOS and Android, but only partially available on the Universal Windows Platform (UWP). In addition, Shell is currently experimental on UWP
As @Jason said, If you do want to add UWP support, please add the project manually, and here is official code sample that contains UWP client. you could refer this to add UWP client.
Xamarin.Forms.Forms.SetFlags("Shell_UWP_Experimental");
For add UWP project for xamarin forms please refer this document.