You can add and edit folders inside your application through the dashboard. Each folder can contain as many pages as you'd like.
Click "Add Menu"
Once you've customized your menu settings, you can Drag and Drop the pages you'd like to show in this menu.
Note: when adding the item to a menu, it will always show outside that menu as well. So there will be two of the same section listed, one in the menu, one outside. This is important for the app structure.
Rearrange menu items...
You can rearrange menu items by dragging and dropping them.