Aperture 3.5: How to hide the white menu bar on a secondary display
OS X Mavericks treats each display connected to your computer as a separate desktop. As a result, when working with a second display in Aperture 3.5, the white menu bar will be visible on the second display (even when you are in full screen mode).
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To prevent the white menu bar from appearing on a second or third display, do the following:
From the Apple () menu, choose System Preferences.
Click Mission Control.
Deselect the option for "Displays have separate Spaces."