Nikon D780 Reference Manual page 193

Option
[Auto-area AF]
The camera automatically
detects the subject and
selects the focus point.
•
If a face is detected, the
camera will give priority to
the portrait subject (face-
detection AF). This lets
you concentrate on composition and facial
expressions even if your subject is in motion ( 0 155).
•
Use on occasions when you don't have time to select
the focus point yourself, for portraits, or snapshots
and other spur-of-the-moment photos.
•
When AF-S is selected for autofocus mode, the active
focus points are briefly highlighted after the camera
focuses. When AF-C is selected, or when AF-A is
selected and photographs are taken using AF-C, only
the main focus point is displayed.
Description
Shooting Settings
147