VS for Mac 17.0 Preview version is not yet supporting MAUI applications. But you can run them on macOS too, but you will need a terminal window for it!
.NET 6 Xamarin and MAUl projects are not supported with this version of Visual Studio. The included target frameworks are not supported: net6.0-android|net6.0-ios|net6.0-maccatalyst
If you are not familiar, how to set up your environment to start developing with .NET newest technology named MAUI, then read this article by me: https://www.banditoth.hu/2021/12/29/setup-net-maui-project-on-macos/
Build and run on macOS
Open up a terminal, and navigate next to your .sln file. Give out the following command:
dotnet build YourSolutionName -t:Run -f net6.0-maccatalyst
This will run your application on macOS. If you wish, you can change the last parameter to net6.0-android or net6.0-ios too.