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 11 | MIUI 12.0
Step 1: Tap on  Camera
Step 2: Tap the  Camera switch button  to switch between front/rear camera
  1. Tap on Camera
  2. Tap the Camera switch button to switch between front/rear camera

Xiaomi Instructions