How do I sort the « À trier » (To sort) faces?
When the computer can’t tell whose face it is, it sets it aside: you are the one who says who it is.
Step by step
In Photos, at the end of the Personnes (People) strip, click the À trier (To sort) badge.
The « Visages non regroupés » (Ungrouped faces) window shows these faces. Click one of them.
In « Qui est-ce ? » (Who is this?), type the name of a new person, or choose a person already known from the list.
The face joins that person: its photos end up with the others.