With this feature enabled on the Xiaomi device, we can tap to focus on a point and then tap again to take a photo, which is useful when we want to move the device as little as possible, as we don't have to remove our hand to tap the shutter release button.

Android 10 (MIUI 12.0)
Step 1:  Open the  Camera app
Step 2:  Open the  menu
Step 3:  Open the  Settings
Step 4:  Enable or disable  Focus & shoot
  1. Open the Camera app
  2. Open the menu
  3. Open the Settings
  4. Enable or disable Focus & shoot

Xiaomi Instructions