After updating to Mavericks, I can not display what is on the desktop to a projector. What adjustment do I need to make?

After updating from Lion to Mavericks, I am unable to see what is on my desktop through a projector connected to my Mackbook Pro. Where do I make a change to a setting that will accomodate the use of a projector?
Warren

Once again, Apple has decided they know the way you want to do this, and you will have to dig in the preferences to turn off these so-called "enhancements".
If you need an app window to span multiple displays [or work the way they used to work] deselect the option "Displays have separate Spaces" in the Mission Control pane of System Preferences.
OS X: Using multiple displays in Mavericks

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