Go to your phone’s display settings, find the “Full screen apps” or “App display in notch” option, and disable full screen for the games. If that’s not available, try turning on “hide notch” again or use developer options to limit fullscreen.
Noob Win Game for tips on third-party apps that can block the notch area. Some games ignore these settings, so you might need a third-party app to block the notch area.