The main menu bar at the top of the screen doesn't show any secondary links, only the primary reference links. Changed from the Greenhouse theme and to Burnt and discovered the secondary menu links listed under the first. Since I have not constructed a complex menu structure yet, I don't know if all secondary menu links are shown or only those for the current primary link that is being hovered over.

So menu presentation is part of the themes. And in general does not work as desired.