Try it!
Change the page orientation in your presentation to landscape or portrait layout.
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Select Design.
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Select Slide Size > Custom Slide Size.
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Select Portrait > OK.
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In the next dialog box, you can:
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Select Maximize to take full advantage of the space available.
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Select Ensure Fit to make sure your content fits on the vertical page.
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Want more?
Change the page orientation in PowerPoint between landscape and portrait
