Content > Pages > Navigation
The navigation will display up to 3 levels of links.
Video Tutorial: Adding A Navigation Item
The Francis theme allows you to switch the navigation design to a hamburger menu style, which is used for the mobile display. This is managed under People > Churches > select default church > select "Mobile Nav Only".
Note: if you have multiple church records setup for your campuses, the record with the "default church" group assigned is the one where this option needs to be enabled.