The scrollbar won't be visible unless you scroll up or down, and then only momentarily. It is there even though you can't see it. Just move your cursor all the way to the right of the window and click somewhere near the top and it will scroll all the way up. Click somewhere near the bottom and it will scroll all the way down. Just because you can't see it doesn't mean it isn't there. Imagine it is there and click where you would normally and it will work just as if the scroll bar was visible. It's there. You just can't see it.