It might happen that during a presentation a discussion starts. Or that you want to have full attention on you. The very lively image or detailed contents on the slide that is beamed to the silverscreen are then not appreciated. A seldom used but very easy method to shut down the content is the “b” (for black) or “w” (white) key on the keyboard. They work in most presentation software and make the full screen either, well, black or white. Use it…
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