The side volume buttons are used by default to control the volume of the ringtone, or alternatively the buttons can be used for general media volume control.

Android 9 | LG UX 9.0
Use Volume Keys for Media Volume -  Open the  Settings
Use Volume Keys for Media Volume -  Tap on  Sound
Use Volume Keys for Media Volume -  Tap on  Volume
Use Volume Keys for Media Volume -  Enable or Disable  Use the Volume keys for media
  1. Open the Settings
  2. Tap on Sound
  3. Tap on Volume
  4. Enable or Disable Use the Volume keys for media

LG Instructions
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