In addition to the selected screen lock, the LG device can also be unlocked with the fingerprint sensor. After adding a fingerprint, unlocking by the sensor is enabled by default, but unlocking the lock screen by fingerprint can also be disabled.

Android 9 | LG UX 9.0
Use Fingerprint to Unlock -  Open the  Settings
Use Fingerprint to Unlock -  Tap on  General
Use Fingerprint to Unlock -  Tap on  Lock screen & security
Use Fingerprint to Unlock -  Tap on  Select screen lock
Use Fingerprint to Unlock -  Enter  Password / PIN / Pattern
Use Fingerprint to Unlock -  Enable or Disable  Fingerprints
Use Fingerprint to Unlock -  If no fingerprint has been added yet, follow the instructions on the screen
  1. Open the Settings
  2. Tap on General
  3. Tap on Lock screen & security
  4. Tap on Select screen lock
  5. Enter Password/PIN/Pattern
  6. Enable or Disable Fingerprints
  7. If no fingerprint has been added yet, follow the instructions on the screen

LG Instructions
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