How do you set up facial recognition on the cam?

I am getting various alerts from my cam, saying ‘someone is spotted’ or ‘a stranger is spotted’ but Indon’t seem to be able to find a way to teach the cam who is a colleague. Online reviewers mention being able to teach the system who was in their family, but I cannot find the method.

Is it possible to turn off the alerts for known faces?

Settings - smart detection
Used phone camera to add mug shots

@Haloweenhamster is correct:

Go to settings → smart detection

The system, for the moment, will alert for known and unknown faces.