In this “Three Minutes Max” video, Nolan Haims shows off a clever way to have content on your slide that disappears when in slideshow mode. Using animation, he sets the timing so that items like page numbers don’t display in a slideshow, but are there when making handouts or sorting slides.
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Source: https://creativepro.com/powerpoint-how-to-hide-onscreen-content-in-slideshow-mode/