The self-timer or delay-timer on the Xiaomi device, triggers the shutter after predefined seconds. We can choose between 3 or 5 seconds delay on the smartphone.

Android 10 (MIUI 12.0)
Step 1:  Open the  Camera app
Step 2:  Open the  menu
Step 3:  Choose  3S / 5S / 10S  or disable the timer
  1. Open the Camera app
  2. Open the menu
  3. Choose 3S / 5S / 10S or disable the timer

Xiaomi Instructions