On a 1440p 16:9 video, with a 1080p 4:5 project, when using the Position and Zoom effect, and clicking fit to height, I expect that the clip is zoomed enough so there's no space in the viewport that is not filled with the clip. Instead, a letterbox effect happens, where there are black bars in the top and bottom of the view port. This requires manual zooming to get correct. Screenshots include both manually adjusted and what the "Fit to height" option does. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Debian testing
Created attachment 175894 [details] Manually ajusted
Created attachment 175895 [details] Automatic fit to height
Thanks for your report, working on it.
See commit: https://invent.kde.org/multimedia/kdenlive/-/commit/a54b22dc59369818070125860bee6131b75a7903