The area under the Two-Level Navigation tabs/buttons (or to the right of the Accordion navigation) is where the components are located for the page. As with a traditional SharePoint web part page, the zones are the location where SharePoint and CorasWorks components can be placed.
Within the CorasWorks Application Designer v4, the Components Section is populated through the Design Canvas. Reports, grids, and other display options are created and modified in the Widgets section of the Design Canvas.