Can someone tell me how to get my horizontal scroll bar back?

I either wanted to copy something or us a cap, and somehow or other pressed the wrong two keys and lost my horrizontal scroll bar. Now the screen is wider than before, but everything is off to the left and looks weird. How do I fix it back to the way it's supposed to be with the horizontal scroll bar?|||Just press your right click and drag to bottom... its simple try it you can do it go for it........