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).
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."