It defaults to full screen. If for some reason it's not in full screen, you can go in the options menu (the brown button with the wrench on the ride side of the view screen) and toggle it - it can run in either full screen or windowed mode. There's no way to alter font size. There was (maybe still is) a way to toggle between two different font choices, the older one admittedly being a little larger, but it's gothic in appearance and harder to read. I don't even know if I removed the ability to toggle that on.