If you modify master slides in a document and later want to return to the original theme defaults, you can reapply the theme to your document or to specific slides.

To restore the theme defaults:
  1. If you want to restore defaults to only certain slides, select them in the slide navigator (press Command to select multiple slides).

  2. Choose File > Choose Theme.

  3. In the Theme Chooser, select the original theme and presentation size.

  4. Make sure “Retain changes to theme defaults” is not selected.

  5. Choose All Slides or Selected Slides from the Apply Theme To pop-up menu.

  6. Click Choose.

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