The Xbox app is an essential to be able to play FS.
However, you can prevent it from starting with windows. Follow the steps outlined here:
https://support.microsoft.com/en-us/windows/change-which-apps-run-automatically-at-startup-in-windows-10-9115d841-735e-488d-e749-9ba301d441e6
Look for “Xbox App Services” in the list of apps.