The volume for the alarm clock can only be changed generally on the Oppo-Smartphone under ColorOS, but not for each individual alarm clock set.

Android 10 (ColorOS 7.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Sound & vibration
Step 3:  Move  Slider  to adjust Alarm volume
  1. Open the Settings
  2. Tap on Sound & vibration
  3. Move Slider to adjust Alarm volume

Oppo Instructions
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