The main window

In the See’n’Sound LE Main window you can find, from left to right and top to bottom:

The Top, Side and Front tabs. Select the view that you prefer by clicking on one of the three buttons.
The “In use” monitor area. The sphere color is the same of the one you have selected in the Source list. You will be able to move the same color sphere in the 2D window.
The “Move Listener” area. Click on the blue sphere to lock or unlock the position of the listener in the 2D window.