There's no way, on Windows, to put S1 into fullscreen mode. I'd like to get a few extra pixels and eliminate the title bar and task bar by entering a proper full-screen mode. In many Windows apps (IE and Chrome both come to mind) you can do this by hitting F11, which seems to be the standard shortcut for toggling this mode (in Studio One it's currently bound to something else, which may warrant changing). A proper full-screen mode would not only offer more screen real-estate, it would also provide a much more immersive experience.
Note: someone once said Mac folks can already do this in S1.