After you've rehearsed your presentation, you may decide that the recorded timings aren't what you want. While you can edit them individually, sometimes it's simpler to reset them all and start over.
Simple!
Select all the slides in slide sorter view, then click the Slide Transition
button (it's at the far left of the Slide Sorter toolbar).
Click Automatically After __ seconds once and you'll get a 0 instead of a blank or whatever number was already there.
Click it again to clear the checkbox and blank the number entry box, then click Apply to all.
Voila.
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