I’ve noticed it works in Chrome but not Safari.

When I drag the submenu under main menu item – it changes the entry from “page” to “column” and the header of that submenu box reads “Mega Menu Column Title”. There’s no check box or option to turn it off. I pasted text from that box below.

Sub Menu Name
Column
↑ | ↓ . Sub item number 1 under .
Mega Menu Column Title (if you dont want to display a title just enter a single dash: “-” )
This column should start a new row

Thanks-
Anna