Nikon D780 DSLR Camera (Body Only) - Manual (Page 328)

282 Other Shooting Options
The camera settings listed below can be restored to default
values by holding the
W ( Y ) and E buttons down together for
more than two seconds (these buttons are marked by a green
dot). The control panel turns off briefly while settings are reset.
Settings Accessible from the Photo Shooting
Menu
Two-Button Reset: Restoring Default
Settings
Option Default
Image quality JPEG normal
Image size Large
ISO sensitivity settings
ISO sensitivity
P , S , A , M 100
Other modes Auto
Auto ISO sensitivity control On