Change Slide Master
Displays the Available Master Slides dialog, where you can select a layout scheme for the current slide. Any objects in the slide design are inserted behind objects in the current slide.
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Displays the slide designs you can apply to your slide. Select a design and click OK to apply it to the current slide.
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Applies the background of the selected slide design to all of the slides in your document.
Delete unused backgrounds
Deletes unreferenced background slides and presentation layouts from your document.
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Displays the Load Master Slide dialog, where you can select additional slide designs.