During "Do Not Disturb" mode, Oppo smartphones mute all app notifications by default, and app management allows you to add individual apps to the exception, so notifications are displayed normally on the Oppo device.
- Open the Settings
- Tap on App management
- Tap on App list
- Choose desired App
- Tap on Manage notifications
- Choose desired Notification category
- Enable or Disable Allow Notification Alerts Under Do Not Disturb