Nikon Z 7 Reference Manual page 119

D
Filter Effects
Choose from the following:
Mode
Y (yellow)
These options enhance contrast and can be used to tone down the brightness
O (orange) of the sky in landscape photographs. Orange produces more contrast than
yellow, red more contrast than orange.
R (red)
G (green) Green softens skin tones and can be used for portraits.
Setting
The i Button
95