the so-called quick settings can be accessed via the status bar of the device. these are hidden in the status bar and are supposed to prevent annoying searches in the settings. in the quick settings, important functions are listed that can be switched on and off by tapping on them once. in the quick settings, you can find

This list may vary depending on the model.

Android 10 | MIUI 12.0
  1. Swipe downwards to open the quick settings/control center
  2. Swipe downwards to access all quick settings
  3. Enable or disable the desired feature/function

Xiaomi Instructions