You can change the details and settings of a menu here.
Menus - These are the menus made by you. You can make/add a new menu or delete it.
Top primary menu - (Top primary menu) Choose which menu in the Menus would like to use as the primary menu. Secondary menu in left sidebar - Choose which menu in the Menus would like to use as the sidebar menu.
Menu Location - Rota supports 2 menus: Primary Menu and Sidebar Menu
Note
You can also do the same thing by following Menu Setup instructions in Widgets & Menu > Menu > Menu Setup.