Nikon Z 6II Reference Manual page 179

A
The Command Dials
•
In some cases, the setting for the item
currently highlighted in the i menu can be
chosen by rotating the main command dial.
Options for the selected setting, if any, can be
selected by rotating the sub-command dial.
•
Some items can be adjusted by rotating
either dial.
•
Press J to save changes. You can also save changes by pressing the
shutter-release button halfway or highlighting another item.
The i Menu
137