The main navigation displays the first level links assigned to your navigation tree to the right of the site logo. "Mega Menus" appear when hovering over a main navigation item.
A mega menu can be made up of a custom section and second level and third level navigation links.
Content > Sections
The custom sections are added to mega menus through the "Sections" manager. The "Sections" manager can be found under the "Content" tab in the main navigation.
A naming convention is used to associate sections to nav items.
The mega menu looks for a "Section" titled "Nav Section - [level 1 nav link title] About Us", where "[level 1 nav link title]" is the same exact name of the corresponding level 1 link title.
For example, the "About Us" link from the top screen shot would have the section of the mega menu labeled "Nav Section - About Us".
If a first level navigation item has any second level links those will also appear in the mega menu as a column link headings. Any related third level links will display directly under the link heading.
*NOTE - The navigation mega menu sections support normal content i.e. text, images, links, etc.
The last level 1 link in the navigation tree will always be a featured link in the highlight color. To display the mega menu the same as the screenshot above this mega menu will have a section with no sub links.