Want a full slide for full page recording

I recorded my screen but get blank spaces above and below the recording.  How can I have the recorded screen take up the entire page in Storyline 2?

I hope this makes sense.  Basically, I have the full screen recorded and put the recording into try step mode.  Each slide is created but has a blank bar above and below the recording.  I would like each slide to be the full screen.

 

Thanks!

 

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