With ColorOS 7 Oppo offers the possibility to display the Always on Display according to a schedule, which was not possible with older ColorOS versions until now.

If the schedule is used, the Always on Display (AoD) is only displayed at the specified time.

Android 10 | ColorOS 7.0
Step 1:  Open the  Settings
Step 2:  Tap on  Display & brightness
Step 3:  Tap on  Always-On Display
Step 4:  Enable or Disable  Schedule time
  1. Open the Settings
  2. Tap on Display & brightness
  3. Tap on Always-On Display
  4. Enable or Disable Schedule time

Oppo Instructions