That popup at the bottom right corner, I don't want it to happen at all, who knows how to stop this popup from ever happening?

Steam/settings/ingame/uncheck enable the stream overlay while in-game

Damn, nice one Sensei!

I thought I already disabled that and thought that had another purpose, however, that done exactly what I wanted and no more not being able to see buttons I wanna press

Thanks!

windows 10 has similar pop-up on game launch, if any1 wants to get rid of it: right click windows icon and choose settings, then go to gaming, there u should find in-game overlay