The game launcher and its integrated game tools on the LG device offers the possibility to disable notifications while using a game, including the option to display an incoming call. The notifications can be enabled or disabled both in the game launcher and directly in the game.

Android 9 | LG UX 9.0
Notifications while playing Games -  Open the  Navigation bar
Notifications while playing Games -  Tap on  Game tools
Notifications while playing Games -  Enable or Disable  Disable alerts during game
  1. Open the Navigation bar
  2. Tap on Game tools
  3. Enable or Disable Disable alerts during game

LG Instructions
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