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You can use a shortcut menu or onscreen tools to move through a slide show that you are presenting. You also can use your right and left arrow keys to move forward and backward.
If you have set up the show for an individual to browse, PowerPoint limits navigation options to a scrollbar or the right and left arrow keys.
Navigate Among Slides
1 With a presentation in Slide Show view, move the mouse.
The Presentation toolbar appears.
2 Click the keyboard right arrow () or press to display to the next slide.
3 Click ...