If you need to display another application window whilst running a PowerPoint presentation – perhaps to demonstrate a specific procedure – you can do so by using Reading View to mimic a split screen facility.
Change the display of the presentation to Reading View (rather than Slide Show view) using the icon at the bottom of the screen or in the view tab:

This will display the slides in a resizable window (rather than full screen) which will allow you to resize it in order to make room on the desktop for another program without obscuring any of the presentation:

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This is question number 2571, which appears in following categories: