This shows the PropSheet main window. Double-clicking row-titles will "gray-out" entire rows. When you choose the File / Save option, PropSheet will skip over grayed-out rows.

This is the Configuration window. It is here that you tell PropSheet what properties you want to edit, and in what order to arrange them.

The Part Viewer window is turned on or off from the View / Show Part Viewer menu option. By default, the part viewer window will 'dock' to the propsheet window. As long as your main PropSheet window does not have the "Always On Top" option enabled, you can choose to have the Part Viewer window stay "On Top" instead of docking to the side. The "On Top" option is most useful if you run PropSheet full-screen.

The Part Highlighting option shows all instances of a part/subassembly by programatically selecting them. The selected parts will be outlined as if you had selected them manually. This feature can be useful for getting a quick idea of where small or hard-to-see parts are located in your assembly.