You can manage app notifications under Settings > Notifications.
Turning Notifications On/Off
From this menu manages all notifications at a system level. There is a single switch to easily enable/disable notifications across the phone, or you can toggle the notifications for individual apps.
Note: Life Mode notification settings are handled separately and can be viewed under Settings > Life Mode > Advanced. Life Mode notification settings only apply when Life Mode is turned On.
You can also edit the default notification sound under Settings > Notifications. From the notifications settings screen
- Tap Default notification sound
- Select a sound
- Tap OK