Am I able to extend the desktop when a 27" display is attached to my IMAC 27"

Am I able to extend the desktop when I use a 27" IMAC and a 27" extra display?

Hi Donald,
Go to System Preferences > Displays > and you should see two different windows, one for your iMac's display and one for the extra display. Click on the one for the extra display. Click on the Arrangement tab at the top. In the lower left corner, uncheck the box for "Mirror Displays" and it should go to extended desktop. You may also wish to check the box for Show displays in menu bar if you need to access the Displays pref frequently.

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