The main navigation for your site is populated with pages and will automatically adjust to a format most appropriate to the hierarchy of the pages on your site. This menu can be created and customized through the Customizer, if desired.
You main navigation will format the drop down menu under each item as a single-column drop down list or as a “mega menu”. Items will either be order by their published date or you can use the “Order” field to assign a number from 0 to 99 to more finely control the placement of the page in the menu structure. By default, the mega menu will build itself by displaying pages from top to bottom in up to 4 columns to help decrease the space needed to show all menu items.