Click the Presentation Type pop-up menu, choose Self-Playing.
You can adjust the controls next to Delay to modify the transition or build effects timing.
In Slideshow Settings in the sidebar, select any of the following playback options:
Automatically play upon open: The presentation begins playing immediately after it’s opened.
Loop slideshow: At the end of the slideshow, the presentation returns to the first slide.
Restart show if idle for: Use the up or down arrow to set the amount of idle time with no viewer interaction before a presentation returns to the first slide.
To play the presentation, click the slide you want to begin with in the slide navigator, then click Add linked objects to make your presentation interactive in Keynote on MacChoose how to navigate your presentation on Mac