If we press and hold the shutter button of the camera app on the Xiaomi smartphone, the device takes a continuous shot or burst shot by default, but we can alternatively change this function to focus.

Android 10 (MIUI 12.0)
Step 1:  Open the  Camera app
Step 2:  Open the  menu
Step 3:  Open the  Settings
Step 4:  Tap on  Press & hold Shutter button
Step 5:  Choose  Record video, Burst shoot  or  Focus
  1. Open the Camera app
  2. Open the menu
  3. Open the Settings
  4. Tap on Press & hold Shutter button
  5. Choose Record video, Burst shoot or Focus

Xiaomi Instructions