Screen view problem

I accidentally hit some combination of keys (Ctrl, Fn, Alt, Home) that changed the perspective of my screen.  It made the remote desktop view very narrow, and now to see some of the screen, I have to arrow down multiple times or arrow to the right several times.  

How do I correct this view perspective so I can see the whole remote desktop without having to use the arrow keys.  This perspective makes Teamviewer unuseable for me.

Thanks,

Rick