system
4
Well, although you also have Avast tray icon → right click “Silent/Gaming Mode” as one possibility (and remember to undo the setting for “every day use” after the game), I don’t think that’s what you are looking for.
Eddy’s suggestion is:
Look for the Avast tray icon → right click → Avast shields control → Disable for…
Be aware, disabling the shields, you are less protected.