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.
Slide design
Displays the slide designs you can apply to your slide. Select a design and click OK to apply it to the current slide.
Exchange background page
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.
Load
Displays the Load Master Slide dialog, where you can select additional slide designs.