If the Xiaomi device is in edit mode on the home screen, we can fill empty cells by shaking the phone, then arrange app icons on the grid and fill empty fields. This feature can be turned on/off.

Note: To open the edit mode in the home screen, tap and hold a free space or empty space.

Android 10 (MIUI 12.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Home screen
Step 3:  Enable or disable  Shake to fill empty cells
  1. Open the Settings
  2. Tap on Home screen
  3. Enable or disable Shake to fill empty cells

Xiaomi Instructions
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