Right click on your desktop display area, that's unused. A small po-up will appear, find the resolution or video manage control panel icon. Click on one or the other and reset your resolution to what is proper. You can play with it and should offer if its OK, to accept, do so, if not return to setting again and re-apply something else until your happy. Apply and exit out to accept the new setting. That was a s/w setting do play with vs. real h/w setting that you can actually fiddle with on your monitor which seems to be the case, as you say, " I have tried making it smaller, moving it, but it only makes one side disappear a little". If you did, return to what was before and correct what I suggested above.