Nikon Z8 User Manual page 865

4
Position the new item.
Press 1 or 3 to position the new item and press J to add it to
My Menu.
5
Add more items.
The items currently displayed in My Menu are indicated by a
check mark (L).
Items indicated by a V icon cannot be selected.
Repeat Steps 1–4 to select additional items.
791
My Menu: Creating a Custom Menu