Fix slide duration

Hi all, wondering if it's possible to fix or lock every slides length? I have a very frustrating issue when I edit slides or insert media, the length shoots to 190 seconds. I'm, constantly having to shorten each slides length so the seek bar doesn't go longer than my audio clips. Does anyone else encounter this? I waste so much time shortening slides. Can't see a way to lock slides to a length of time if this was possible would be great.

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