The volume for the alarm clock can be controlled independently of the media or ringer volume, and can also be set for each individual alarm.

Android 9 | LG UX 9.0
Step 1:  Open the  Clock -App
Step 2:  Tap on desired  Alarm
Step 3:  Move  Slider  to adjust alarm volume
Step 4:  Confirm with  OK
  1. Open the Clock-App
  2. Tap on desired Alarm
  3. Move Slider to adjust alarm volume
  4. Confirm with OK

LG Instructions
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