Notifications appear when gaming even with alerts blocked
If you’re receiving calls, messages, and app notifications when playing gaming apps, you can turn on the "Block during game" feature in Game Booster. This will block certain notifications whenever you have a game opened, so you won't have to worry about being interrupted. However, keep in mind that some notifications cannot be blocked and will always appear during games.

Notifications appear when gaming even with alerts blocked
Note
Game Booster cannot be turned off or disabled.
2
Turn on the Block during game feature.
Tap Block during game, and then tap the switch next to Notifications. This will prevent certain notifications and alerts from appearing when you're playing a game. You can also tap the switch(es) next to the additional settings if desired.
Keep in mind that not all alerts will be blocked, such as alarms and certain app notifications, like those from Facebook Messenger.
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