Content > Link Lists > "Header Links"

The default navigation shows two levels.

For navigation areas with three levels of links the second level will display as a smaller header.

For navigation areas with four levels of links the second level will display as a column with a larger header.  For items with four levels of links the third level will display as a smaller header.  

*NOTE -  If the second level header has a link the view all text will appear on hover.