You can apply a different theme to the currently selected slide or slides in either Normal or Slide Sorter view. If you apply a different theme to a single slide, be sure it complements the design used on other slides. The transition from one theme to another as you move from slide to slide can be jarring to your viewers.
Apply a Design to Selected Slides
1 Select the slide(s) to format in Normal or Slide Sorter view.
After selecting the first slide in the Slides tab or Slide Sorter view, +click thumbnails ...