Navigation zones allow users to navigate through the menus you create on your Masthead.
Left and Right Navigation Zones
On devices with large screens, the Left and Right Navigation zones will appear on the left of the navigation bar.
In responsive mode, Masthead will reorder into a vertical menu better suited for smaller screens. The Left Navigation zone will display at the top of this menu, followed by the Right Navigation Zone.
The Footer zone is displayed at the bottom of each page, regardless of display size. In the footer, you can add links to sites as well as a custom message.