How to hide desktop from projector - HELP :)

ok guys, I am very new to all things "projector". I have been using the openlp and the remote function and I am very pleased with it. Now I have someone who is going to operate the overhead projector from our sound booth and I wont need to use the remote function. The problem is we can't figure out how to hide the desktop so he can work on the displays. everything on the desktop is seen on projection screen. I know this might be a easy thing to do but I have not been able to figure it out. We run the openlp on a laptop, we have two projector screens connected to said laptop. 


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