So Gantry allows for level 1 sub-menu items to be arranged in columns, but level 2 doesn't have this functionality.
I tried using a menu module and css changes to make 2 column. The problem is with the mobile menu, the items aren't accessible.
Is there a way to setup the Gantry 5 menu system for level 2 into columns? I see we can assign classes to menu items, but can't seem to get the effect.