Samsung Galaxy J4+ User Manual page 141

Settings
Registering your face
For better face registration, register your face indoors and out of direct sunlight.
On the Settings screen, tap Biometrics and security → Face Recognition.
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Unlock the screen using the preset screen lock method.
If you have not set a screen lock method, create one.
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Select whether you are wearing glasses or not and tap CONTINUE.
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Hold the device with the screen facing towards you and look at the screen.
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Position your face inside the frame on the screen.
The camera will scan your face.
When a face lock screen appears, tap TURN ON to use your face to unlock the screen.
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.
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