One monitor and every "screen" I go to the left side is cut off. I can only see 1/2 of the icons on the left on my home screen (desktop?) and the "start" is not visible.

My Sony monitor is...

First time user, today, the left side of my monitor screens are cut off, can't see the icons and same when I use my email. Cant recall doing anything to cause this misbehavior. Any advise be much...