Fingerprints stored on the LG unit can be removed one at a time, and the current password/PIN/screen lock pattern is required to delete a print.

Android 9 | LG UX 9.0
Step 1:  Open the  Settings
Step 2:  Tap on  General
Step 3:  Tap on  Lock screen & security
Step 4:  Tap on  Fingerprints
Step 5:  Enter  Password / PIN / Pattern
Step 6:  Tap on  Remove
Step 7:  Confirm with  Delete
  1. Open the Settings
  2. Tap on General
  3. Tap on Lock screen & security
  4. Tap on Fingerprints
  5. Enter Password/PIN/Pattern
  6. Tap on Remove
  7. Confirm with Delete

LG Instructions