Can my extended desktop on my iMac be treated as a separate desktop vs just an extension ?

When I plugged in an external monitor via thunderbolt to DVI cable, I was hoping to gain an additional view of the various desktops.  instead I got an extension of my current desktop, which is really cumbersome to move through various appellations i have open, e.g. Fusion 6.0 seems to want to stay on all the desktops I swish through.
Mark

Hi markpaq, 
Welcome to the Apple Support Communities!
With an external display, there are two different arrangements you can set. You can either use a mirrored display or extended desktop. Please use the attached article for more information on configuring your external displays. 
OS X: How to use multiple displays with your Mac in Mountain Lion and earlier
Have a great day, 
Joe

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