Nikon D7200 body - Manual (Page 77)

77 Menu Guide
Choose On to display on-demand grid lines in the viewfinder for
reference when composing photographs using the DX-format
image area (
0 37).
If On is selected, ISO sensitivity can be set in modes P and S by
rotating the sub-command dial or in mode A by rotating the
main command dial. Select Off to set ISO sensitivity by pressing
the
W (S) button and rotating the main command dial.
d7: Viewfinder Grid Display
G button
➜ A Custom Settings menu
d8: Easy ISO
G button
➜ A Custom Settings menu