See Skin Editor - Panels for more details on this view.
In the ROOT skin the panels outside of the core list (dashboard, flaglogic and main) show as customised. When you copy ROOT skin to create another skin, these panels will show in the new skin as inherited until you make changes, and then they will show in the customised panel list. See Skin Hierarchy for more on this.
The main panel is the top level container for all other panels. It is the one panel that must be there for any content to appear in a page.
The flaglogic panel is automatically included.
|panel or confluence content||content||content||(dashboard macros)||(content-body)||content|