Keeping Computer Screen With Program While Projecting

I have to have a portable set-up.  I am using a Macbook Air for OpenLP and an Epson V5250 projector.  They are connected by USB cable.
My problem is when I go "Live" and project the Service Themes to the screen, what is being projected fills my computer screen also, keeping me from seeing the upcoming service slides.  How can I set it up so that what I select to project is projected, while my computer screen displays the service, so I can see what to go to next?

Thanks for any help.

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