If the Xiaomi smartphone's screen doesn't turn off during a call, it's possible that we accidentally enable functions with the ear such as the speaker. To avoid this, we can activate the proximity sensor, which darkens or turns off the screen during a phone call.

Note: The function is not available on every Xiaomi model.

Android 10 (MIUI 12.0)
Step 1:  Open the  Phone app
Step 2:  Open the  Settings
Step 3:  Tap on  Incoming call settings
Step 4:  Enable or disable  Proximity sensor
  1. Open the Phone app
  2. Open the Settings
  3. Tap on Incoming call settings
  4. Enable or disable Proximity sensor

Xiaomi Instructions
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