Samsung SM-N975F/DS User Manual page 210

Settings
3
Set a screen lock method.
4
Select whether you are wearing glasses or not and tap Continue.
5
Hold the device with the screen facing towards you and look at the screen.
6
Position your face inside the frame on the screen.
The camera will scan your face.
If unlocking the screen with your face is not working properly, tap Remove face data
to remove your registered face and register your face again.
Deleting the registered face data
You can delete face data that you have registered.
1
On the Settings screen, tap Biometrics and security → Face recognition.
2
Unlock the screen using the preset screen lock method.
3
Tap Remove face data → Remove.
Once the registered face is deleted, all the related features will also be deactivated.
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