For example, to record a selfie with the OnePlus smartphone, we can quickly switch between the front camera and the rear or main camera.

In low light conditions, the display is brightly lit to simulate a flash and illuminate the selfie to be recorded.

Android 10 | OxygenOS 10.0
Switch between front/main camera -  Open the  Camera app
Switch between front/main camera -  Tap on the  camera-switch
  1. Open the Camera app
  2. Tap on the camera-switch

OnePlus Instructions