In order to take a selfie with the Huawei smartphone, we can easily switch from the main/rear camera to the front camera.
The first time we take a selfie, we are asked whether the photos should be mirrored, which means that writing in the background is still readable, or rooms otherwise gain a different appearance than usual.

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

Huawei Instructions