By default, the Xiaomi smartphone uses WLAN and Bluetooth location tracking even when these features are disabled. Once an app has permission to track the location, these features are used to determine the most accurate data possible. We can turn WLAN and Bluetooth tracking on/off individually.

Android 10 (MIUI 12.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Location
Step 3:  Tap on  Wi-Fi and Bluetooth scanning
Step 4:  Enable or disable  Wi-Fi and/or Bluetooth scanning
  1. Open the Settings
  2. Tap on Location
  3. Tap on Wi-Fi and Bluetooth scanning
  4. Enable or disable Wi-Fi and/or Bluetooth scanning

Xiaomi Instructions