select which apps activate game mode

hi i have a pixel 6, ive had it for 2 years and it's a great phone i like it a lot!

i don't play a lot of games on my phone, but there is one rhythm game i like to play sometimes that plays in landscape mode and has things to press across the entire screen. because of this, i decided to enable do not disturb while gaming today, because the banner notifications basically cover the entire screen and make the game unplayable. i don't know if it disables the banners or not, i haven't tried it.

the thing is, i don't want this to be the case for all of my games, really only just this one. i like to see my notifications when playing games (especially if they are in portrait mode bc then it's not an issue) because i have adhd and will forget to text people back a lot. on an older phone, you were able to choose which apps trigger the game mode. i cannot find that feature on this phone. is it a thing?? if not, what classifies as a game?