Keynote
Keynote User Guide for Mac
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Welcome
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Use iCloud Drive with Keynote
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Export to PowerPoint or another file format
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Reduce the presentation file size
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Save a large presentation as a package file
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Restore an earlier version of a presentation
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Move a presentation
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Delete a presentation
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Password-protect a presentation
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Lock a presentation
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Create and manage custom themes
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Copyright

Change the slide size in Keynote on Mac
You can change the slide size to fit screens with different aspect ratios.
Note: You can’t change the slide size of a presentation you’re sharing with others.
Change the slide size
In the Document
sidebar, click the pop-up menu below Slide Size and choose a new size. If you choose Custom Slide Size, enter slide dimensions, then click OK.
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