You do not have any scenarios on the site so I will have to presume you mean either in the greenfoot application or in a stand-alone app. In the greenfoot application you can expand by maximizing the window or dragging the edges. (if you cannot expand enough to remove them, then I do think there is anything you can do about it) For a stand-alone, I may have to test it out. But, if it is anything like on the site, you can run the scenario to a point where the largest screen is showing, expand the window to remove the scrollbars and then create the stand-alone.