Best method to fix cropped images in Jellyfin

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It has been probably a decade or more since I used Kodi (XBMC, maybe even a different iteration at the time) so I'm not sure I can be much help there. I know there are several folks who use the plugins here in the forum though. You might make a different topic if you have Jellyfin-centered questions. For general knowledge-building however, I'd have to point you towards their quick start guide: https://kodi.wiki/view/Quick_start_guide.