In the page editor in the HubSpot Content Hub, pages are organized by:

HubSpot’s page editor uses a drag-and-drop layout model, not a design-asset model based on reusable setup files. Inside that editor, the content hierarchy is built from sections into rows and columns , while the editable page elements are handled as modules . HubSpot’s content editor documentation explicitly describes the sidebar as an overview of those four elements. That is the structure used to arrange layout and manage content within a page. HubSpot Knowledge Base+1