The Top pane contains the 
Floor Plan, 
Table Plan, 
Schematic, 
Table Chart, 
Guest Chart, 
VDU chart, 
Stationery and 
Report panes. These are all different views of your plan.
If View>User Interface>Expert is selected you can hide this pane by clicking on the 
button at top-right of the pane or using View>
Top pane or the equivalent Main tool bar button.
You can resize this pane using the splitter between it and the Left pane and the splitter between it and the Bottom pane.
Use Ctrl+Tab to cycle between the panes (tabs) within the Top pane.