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Please open System preferences and select the Mission Control preference pane, where you will see an option labeled 'Displays have separate Spaces.'


When this checkbox is selected, OS X will snap a window to whichever display that window has the most area on.


When unchecked, OS X will allow a single window to span across multiple displays (including duet) and will act as one large continuous display.


Any changes to this setting does require a logout.


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