Samsung
Delete a Saved Fingerprint auf Samsung
Samsung phones let you store several fingerprints so different people or fingers can unlock the device. This convenience becomes a security risk once a fingerprint is no longer needed, since any registered print can pass the sensor check and reach your data, apps, and payment tools.
Each fingerprint is managed individually in the security settings, so you can remove a single entry without resetting your screen lock or deleting the other stored prints. This is the right fix when you know exactly which fingerprint should go, for example after lending your phone to someone or after registering a print that scans unreliably.
To remove a fingerprint, go to Settings ➔ Biometrics and security ➔ Fingerprints. Confirm your identity by entering your current Pattern, PIN, or Password. Select the fingerprint entry you want to get rid of, tap Remove, then tap Remove again to confirm.
If you cannot tell which entry belongs to which finger, it is safer to delete every fingerprint and re-register only the ones you actively use. This also helps if the sensor keeps misreading a print, since a fresh scan usually performs better than a degraded one.