The main screen interface can be rotated horizontally for easier operation.
Follow these steps to enable screen rotation on Xiaomi Mi A1:
Step 1: Long-press on an empty space outside the screen.

Long-press on an empty space outside the screen.
Step 2: Select Settings.

Select Settings.
Step 3: Enable screen rotation.

Enable screen rotation.
Step 4: Landscape interface.

Landscape interface.
This completes your setup process. Wishing you success.
