Black edges around video after exporting

I am editing 1080p video in shotcut. In shotcut, the video fills entire preview window. But after export, the video is smaller and has black edges around video.
I have seen this issue in previous topics but havent seen a solution. What might be the problem. A bug in previous version?

I figured out myself now. Settings/Video Mode must be set manually to get correct output.
I have series of video lecturers to edit. With previous ShotCut versions, automatic settings worked fine but not anymore. Source material has been always the same format for years.

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