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In addition to the ringtone, media or alarms volume, the Oppo smartphone also allows adjusting the volume for notifications. This includes notifications from apps as well as incoming text messages.

Android 11 | ColorOS 11.0
Step 1: Tap on  Settings
Step 2: Tap on  Sound & vibration
Step 3: Set the  Notifications volume
  1. Tap on Settings
  2. Tap on Sound & vibration
  3. Set the Notifications volume
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Oppo Instructions