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Do you remember it being RS = mouse movement or Xbox button + RS = mouse movement?
What is the window that opens? Something from Steam or those games' launcher?
An option for mouse control is to use the guide button chords.
Go to Steam > Settings > Controller > Guide Button Chord Layout > Edit > View Layout, and you'll see what the mouse controls are mapped to.
The Guide Button Chord layout is applied while the Xbox button is held.
Can be stuff to change if it doesn't work right off the bat.
There's also the Desktop Layout where you don't hold the Xbox button. This layout is applied when you're outside of an application Steam shows as running (looks like non-Steam games can have things a bit different though).
Maybe something was changed relating to one of those layouts.