Once uninstalled go to the Microsoft store and reinstall the sim from there You need to be logged on to the store with the same account as you purchased the software.
Yes you need the Gaming services app installed. As far as I can understand it tracks your online status keeps all your flight records. Why would you want to remove it anyway ?
Dont give up on Msfs as you know its far better, out of the box, than anything else out there
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Dale