making a slide layer play onty once

I have a project that I have built an intro to play as a "show layer when timeline starts"- so that i can have a character with narration  begin the course.  But this is set up as a dashboard so that the learner can return frequently to review or access more info.  I don't want the intro to play every time.  I can't figure out how to make the intro play only one - any ideas?



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