When capturing photos of multiple people, such as a concert or public event, the image may include the faces of people you don’t know. Tag the face(s) you want to remember, then use the Ignore Untagged Faces option to remove the rest from your Untagged collection.
Open an image in Single Photo View, then click the Face Tagging icon .
Tag each person you wish to name.
To ignore the remaining face tags, click the info icon to access the Info Panel.
Scroll down to the People section and click Ignore Untagged Faces.