Nikon D780 DSLR Camera (Body Only) - Manual (Page 497)

451 Network Connections
Disconnecting and Reconnecting
The camera’s link to an existing network can be suspended or
resumed as described below.
❚❚
Disconnecting
You can disconnect by turning the camera off, selecting
[
Disable ] for [ Connect to PC ] > [ Wi-Fi connection ] in the setup
menu, or selecting [ Wi-Fi connection ] > [ Close Wi-Fi
connection ] in the still-photography i menu. The connection
to the computer will also end if you use Wi-Fi or Bluetooth to
connect to a smart device.
D Access-Point Mode
An error will occur if the computer’s wireless connection is disabled
before the camera’s. Disable camera Wi-Fi first.