Nikon D500 - Manual (Page 82)

82 Menu Guide
This item is displayed only with lenses that support it. Selecting
Enable allows the lens focus ring to be used for manual focus
when the camera is in autofocus mode. After pressing the
shutter-release button halfway to focus, keep the button
pressed halfway and adjust focus using the focus ring. To
refocus using autofocus, lift your finger from the shutter-release
button and then press it halfway again. To prevent the lens focus
ring being used for manual focus when the camera is in
autofocus mode, select Disable.
a13: Manual Focus Ring in AF Mode
G button
➜ A Custom Settings menu