This isn't so relevant but Steam is actually very annoying to use. No easy settings to disable some of the overlays. I played Final Fantasy 7 and it was some gimped out graphics version, although SE (Square Enix) is also a kind of litigious company

Steam only adds one overlay (which is pretty easy to toggle off). if you have another graphic change or overlay it's the devs or publisher who added it

There's a per game toggle for their UI overlay basically and you just need to uncheck a box