The LED flash on the back of the Xiaomi smartphone is not only intented for use with the camera or flashlight function, but also to activate a flash on incoming calls to provide additional visual notification of a call.

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  Flash when ringing
  1. Open the Phone app
  2. Open the Settings
  3. Tap on Incoming call settings
  4. Enable or disable Flash when ringing

Xiaomi Instructions
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