Rog Phone 2, Some games are not in full screen

[cokadam]

Hi, as I mentioned in the header some games are not run in full screen. It's like the game fills the screen left to right but some area on the right side of the screen keeps blank.
That game below was in the Armoury Create list that it's support 120hz. (Eternium) Please download and test it if it's same on your phone. There was a few more game but I deleted already.
is there anyone has this problem?
Thank you.

[cokadam · Accepted solution]

I figured it out, if someone need just go to:
Settings,
Display,
App Scaling
then choose which app you want to run in full screen or not.

[WaitingKy]

is there anyway to make it centered? i don't want to stretch the game