If you want to take a group photo, there's no getting around the self-timer. the Oppo smartphone's camera also offers us the self-timer. the timer can be set to either 3 or 10 seconds before the shutter is automatically released.

Android 10 | ColorOS 7.0
Step 1:  Open the  Camera -App
Step 2:  Open the  Menu
Step 3:  Tap on  Timer
Step 4:  Tap again to adjust the  duration
  1. Open the Camera-App
  2. Open the Menu
  3. Tap on Timer
  4. Tap again to adjust the duration

Oppo Instructions