I am also new to the widescreen gaming boys!! I asked this question a couple days ago. I never did get a reply, but I keep screwing around and figured it out.
What I do to get out of widescreen gaming mode is open the Catalyst Control Center.
1. Click on Graphics tab.
2. Click on drop down tab and choose Desktop and Displays.
3. You will now see three boxes that show the three monitors. Click on the third box's triangle drop down tab.
4. Click on Diplay group and choose disable. You should get a Display Group Warning pop up. Stating: Are you sure you want to execute this action? Choose Yes.
All three monitors should now be cloned. Turn off the monitors you don't want to use for your tasks.
cheers
thats not really a great solution though as it can cause display port funnies and your not able to use your other two screens for productivity.