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Helpful answers
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Feb 1, 2016 11:58 PM in response to Sammi!Cby Jason L,★HelpfulHey there Sammi,
Welcome to Apple Support Communities.
If I understand correctly, you want to know how to set up one continuous desktop that spans across your MacBook Pro and your external monitor rather than have the same image appear on both displays. Try taking a look at the article below which outlines the available display option preferences and it will also walk you through the process of setting up extended desktop.OS X: How to use multiple displays with your Mac in Mountain Lion and earlier - Apple Support
Take care.
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Feb 1, 2016 11:59 PM in response to Sammi!Cby Duane,★HelpfulYou want to disable mirroring so that you enable extended desktop.
