Nikon D810 - Manual (Page 378)

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Selecting Enable release allows the shutter to be released when
no memory card is inserted, although no pictures will be
recorded (they will however be displayed in the monitor in
demo mode). If Release locked is selected, the shutter-release
button is only enabled when a memory card is inserted in the
camera.
If is selected, the exposure indicators in the
control panel, viewfinder, and information display are displayed
with negative values on the left and positive values on the right.
Select
to display positive values on the left
and negative values on the right.
f11: Slot Empty Release Lock
G
button ➜ A Custom Settings menu
f12: Reverse Indicators
G
button ➜ A Custom Settings menu