the volume of the notification tone can be changed separately from the ringtone on the LG device. the setting affects notifications from the system, but also from apps. the volume for notifications can be changed not only in the tone settings, but also using the volume keys. to do this, press the key once and expand the menu.

Android 9 (LG UX 9.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Sound
Step 3:  Tap on  Volume
Step 4:  Move the  Slider  to adjust the  Notification volume
  1. Open the Settings
  2. Tap on Sound
  3. Tap on Volume
  4. Move the Slider to adjust the Notification volume

LG Instructions
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