How to remove all slide borders in Storyline?

Hello,

I feel like I've gone through every possible option in the player effects to make the entire player white so it blends into the background.  The reason I have this image in Storyline and not directly in rise is because I'm trying to find a workaround to force the audio to automatically play.  Can anybody offer any suggestions?

Admin, please suggest the option to auto play audio directly in Rise. Thank you!

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