On the Oppo smartphone, the flashlight is only accessible via the quick settings and not as an app shortcut or similar.

Android 11 | ColorOS 11.0
How to Turn On/Off Flashlight - Swipe with  two fingers  to open Quick settings
How to Turn On/Off Flashlight - Enable or disable  Flashlight
  1. Swipe with two fingers to open Quick settings
  2. Enable or disable Flashlight

Oppo Instructions