That thing meant to be turned on manually, but it turns on automatically when you play any kind of gaming app

Bro it's better than using an extra app for those things & wasting memory space or maybe you don't know how to use it

Bro , go to settings > modes & routines > game > then set your preffered option & don't forget to select turn on when game is being played , & you're done ✅Next time whenever you play any game it will turn on with game mode automatically.Don't forg...