Using the switch access (universal control command), motor-impaired persons can operate the LG smartphone using one or more switches. After activation, the smartphone must be "learned" using the switch accesses.

Android 9 | LG UX 9.0
Universal Switch -  Open the  Settings
Universal Switch -  Tap on  General
Universal Switch -  Tap on  Accessibility
Universal Switch -  Tap on  Switch Access
Universal Switch -  Enable or Disable  Switch Access
  1. Open the Settings
  2. Tap on General
  3. Tap on Accessibility
  4. Tap on Switch Access
  5. Enable or Disable Switch Access

LG Instructions