Dual Monitors With Ubuntu - Issues

Hello!

I am currently running Ubuntu 14.04 with all the latest updates. I have two 21in monitors that I have side by side. Whenever I run the two monitors off of my Alienware 14 laptop they look fine. But when I try to make a window full screen it takes over both monitors. I am wondering if anybody knows how to fix this. My graphics card is a Nvidia GT750m and my CPU is a i7-4700MQ.

Thanks!

Do you have two workspaces?

I have six in total. 3 wide, 2 tall