Engage slide duration in audio editor

I have a ppt presentation that includes about nine slides and an Engage timeline interaction. When published each ppt slide is approx 1sec in duration which is great however the Engage interaction is 1min 20 sec long. I need a shorter duration so that the forward navigation arrow(in the published file) becomes active quicker. I've gone into the audio editor and delete all but  5 sec and save the audio editor edits. If I then open up the audio editor the Engage interaction slide is right back at 1 min 20 sec. It's like the Engage interaction is forcing the longert slide duration. How can I shorten the duration of the Engage slide in the audio editor?

Thanks.

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