Microsoft has decided that this ap cannot be (easily) uninstalled by the user. Clicking on uninstall does absolutely nothing...no error message, no nothing.
search or open Powershell (Run as Administrator)
Copy and past this command into Powershell:
Get-appxpackage -allusers *Microsoft.XboxGamingOverlay* | Remove-AppxPackageArticle ID: 1152, Created On: 12/9/2019, Modified: 12/9/2019