There have been reports from Windows and Linux users, that the game viewport in fullscreen might not be entirely visible (cut off at the sides) on monitors with 16:10 aspect ratio. Unfortunately, at the moment we can't reproduce the issue on the hardware at our disposal. While we're working to fix this issue, you can resort to a temporary workaround solution in order to see the full viewport on the screen: press the key combination ALT+ENTER to switch from fullscreen mode to windowed mode, then resize the window so you can see the whole game viewport, although not in fullscreen.