Go to Settings> System> Game Mode to enable it.
Game Mode is built into Phone (2) and allows you to manage notification display, false-touch protection, game screen color enhancement, game anti-disturbance, etc. to improve your game experience.
Game Mode by default downloads and installs game applications from the Play Store. If the game application is downloaded from other channels, it will need to be manually added to Game Mode. Go to Settings> System> Game Mode> Apps> Add Apps, and add the corresponding game application.