In order to bring the main window to full screen, you can use your arrow keys or the virtual mouse.
When using the arrow keys, your current selection will have a blue highlight surrounding it.
Using the arrow keys, navigate until the main window is highlighted and press 'OK', this will bring the main window to full screen.
To use the virtual mouse, press the Green button on your remote.
Once activated, use the arrow keys to position the cursor over the main window and press 'OK' to bring the main window to full screen.
You may need to press the 'OK' button twice to activate full screen mode when using the virtual mouse.