OpenLP does not currently support more than one output, meaning 2 different outputs is not currently possible.
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However, you can use an another program, such as PowerPoint/VLC to show Presentations/videos etc.
in 2nd projector while showing things on 1st screen in OpenLP.
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If I understood correctly you only have two projectors and no monitor?
This makes it a bit difficult to operate two fullscreen applications at the same time.
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Hope this helps,
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Azaziah