If we want to take a picture of a selfie with the Xiaomi smartphone, all we have to do is tap the camera switch.
To help us in darker lighting conditions, the display of the device shines in white to simulate a camera flash for the upcoming selfie. Nevertheless, it should be noted that a well-lit environment is an important part of any photo or selfie.

Android 10 (MIUI 12.0)
Step 1:  Open the  Camera app
Step 2:  Tap the  camera-switch
  1. Open the Camera app
  2. Tap the camera-switch

Xiaomi Instructions