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The Clear buttons sit beside the preview window. Each one removes one part of what is showing on the screens, so you can take something off without stopping everything else. The icons match the ones in ProPresenter's Clear Groups window.
Clear All
Removes everything on the audience screens at once. Use it first when something is wrong and you are not sure what caused it.
Messages
Removes any message shown to the audience. Use it once a message is finished.
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