I couldnt find a way to enble it on my phone.i have rog phone 2. Should i tweak any settings?
Depends on which "Auto Chess type" game you are referring to.
For example Chess Rush (go into game settings enable FPS high).
"Auto Chess" was originally on this list, but I tried it again, and the settings now only allow to 60fps - they likely removed this support.
The game right now only supports 60 FPS Which is great and comfortable to play with but such a big company and any time roll out update for 120 FPS, Now COD mobile has much higher graphics than PUB mobile and it dosen't lag or don't have frame drops so even playing it at 60 frame rates is really smooth experience.