Switch access allows people with motor disabilities to operate the Xiaomi smartphone and other mobile devices using one or more switches. Switches can be used to select items, scroll, enter text and more. Suitable devices can be connected via USB or be paired via Bluetooth.

Android 10 (MIUI 12.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Additional settings
Step 3:  Tap on  Accessibility
Step 4:  Tap on  Physical
Step 5:  Tap on  Switch Access
Step 6:  Enable or disable  Accessibility
Step 7:  Tap on  Allow
Step 8:  Choose  USB switch  or  Bluetooth switch
Step 9:  Tap on  Next  and follow the instructions on screen
  1. Open the Settings
  2. Tap on Additional settings
  3. Tap on Accessibility
  4. Tap on Physical
  5. Tap on Switch Access
  6. Enable or disable Accessibility
  7. Tap on Allow
  8. Choose USB switch or Bluetooth switch
  9. Tap on Next and follow the instructions on screen

Xiaomi Instructions