If the touch tone is enabled on the LG unit, the volume can also be adjusted in the tone settings.

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  system volume
  1. Open the Settings
  2. Tap on Sound
  3. Tap on Volume
  4. Move the Slider to adjust the system volume

LG Instructions
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