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Slide Show Menu

Slide Show → Start Presentation → From Current Slide (Shift+F5)

Begin the slideshow from the current slide.

Slide Show → Start Presentation → From First Slide (F5)

Begin the slideshow from the first slide.

Slide Show → Configure Slide Show...

You can set up the properties for the entire slide show here, including whether to show the duration on screen, which of the slides in a presentation to include, and several other global settings.