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)
Step 1:  Open the  Settings
Step 2:  Tap on  Sound
Step 3:  Tap on  Volume
Step 4:  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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