How do I get rid of the black bars in my video

Iam new to Shotcut and Iam trying to edit a video to upload it on Instagram. The video has 2 black bars left and right. I dont know what the size of the actual video without the bars is. How do I crop the video? I tried it with the “Crop: Source” filter, but it doesn’t crop the video size and after exporting the black bars are still there.

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