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I'm editing a vertical video and have greyed out blocks at the top and bottom of my video, over the top of my clips. Not sure what i've done, but unable to get rid of them and they show up when I export the video

I'm editing a vertical video and have greyed out blocks at the top and bottom of my video, over the top of my clips. Not sure what i've done, but unable to get rid of them and they show up when I export the video. How do I remove them?
