If during a conversation on a Xiaomi smartphone with MIUI firmware you notice that the screen does not go blank at this time, then the matter is most likely that the proximity sensor is disabled – Xiaomi is one of the few companies that allows you to turn it on or off. So just turn on the sensor, and if it is already on, turn it off and on again. We show how to do it..
Open the “Settings” on the desktop.
Next, open the item “System Applications”.
Tap on the line “Phone”.
Select “Incoming Calls”.
Turn on the proximity sensor.
Or disconnect if necessary.
Check the operation of the screen when making calls.