After upgrading realme UI 3.0, 'Game Space' was renamed to 'Games'. For a better gaming experience, you can set Do Not Disturb in the game mode.
Setting path:
realme UI 6.0 & 5.0 & 4.0 & 3.0: Games > three dots on the top right > Settings > Do not disturb > Answer calls on speaker / Notification style / Brightness lock
realme UI 1.0 & 2.0: not support
realme UI R & S & T & U & Go edition: not support