Samsung TV as monitor with HP laptop

I am new to OpenLP, I am sure this question has been asked before, but I need urgent help.  I have extended display set up but I cannot toggle between the the laptop and the TV monitor,  when I do it shows on the main monitor that the congregation sees.  When I use the "Black Screen" icon it goes black on my desktop also which means I can't work.  Any Help is greatly appreciated.  Thanks


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