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