Nikon Z 9 Reference Manual page 56

Custom Settings menu option
g13 [Limit zebra pattern tone range]
g14 [Grid type]
g15 [Brightness information display]
g16 [Custom monitor shooting display]
[Display 1]
[Display 2]
[Display 3]
[Display 4]
g17 [Custom viewfinder shooting display]
[Display 1]
[Display 2]
[Display 3]
g18 [Red REC frame indicator]
Menu Items and Defaults for "C" Firmware Version 3.00
56
Default
No restrictions
3×3
Histogram
L (cannot be deselected)
M
M
M
L (cannot be deselected)
M
M
ON