Structure of the dropdown and how its internal parts are composed. These are its semantic parts, so they are also what the classNames and styles objects accept. The trigger is your own element: className lands on it, and everything but root is passed on to the menu inside, submenus included.
Name
Description
1
root
The popup panel. It is portalled to <body>, so this key is how you reach it. placement and arrow set where it opens and whether it points back.
2
item
One option, from an entry in menu.items.
3
itemContent
The option's content area, which also styles a link inside it.