Nikon D780 DSLR Camera (Body Only) - Manual (Page 646)

600 Menu Guide > A Custom Settings
This item is available with compatible lenses only. Choose
whether the lens focus ring can be used for manual focus in
autofocus mode.
a12: Manual Focus Ring in AF Mode
G button
U A Custom Settings menu
Option Description
[ Enable ]
Autofocus can be over-ridden by rotating the lens focus ring
(autofocus with manual override). The focus ring can be used
for manual focus while the shutter-release button is pressed
halfway. To refocus using autofocus, lift your finger from the
shutter-release button and then press it halfway again.
[ Disable ]
The lens focus ring cannot be used for manual focus while
autofocus mode is selected.