The product is only available in tabbed MDI style, as tabbed MDI is the proven solution which removes the strain on the operating system and the directory servers. Top tabs are for the connections and the active tab is highlighted where the inactive tabs are not. The bottom tabs are for the tableview, schema view and search results with in the connection tab.
You can switch between the sheets with corresponding sheet tabs or using Ctrl+Tab. If you don't see the tool you want, click the tab scrolling buttons to display the tab, and then click the tab. To close the tab click on the "x" button on the tab you want to close.