Stop display mirroring

I am running Yosemite on a MacPro with three monitors connected in addition to the TV. I just connected an Apple TV to my network and since then the displays keep mirroring even when I am not using the Apple TV. Is there some way to turn off mirroring permanently or at least make it so that it is not the default?

Open the Displays pane in System Preferences. If there is an Arrangement tab, select it and then uncheck the box marked
Mirror Displays

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<Image Edited by Host>

I found a way to work around this issue. Not a fix but a work around.
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Mirror Displays
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Stop display mirroring

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