

MKVToolNix has a great cropping feature that completely lossless because it just writes an information into the file how many pixels to leave out.
The massive problem since quite some time is that I’m not aware of any media player respecting this. VLC used to support it but a decade ago suddenly stopped: https://code.videolan.org/videolan/vlc/-/issues/13982
If you have the originals, maybe encode them again. HandBrake has a nice preview feature.
Yeah, XWayland will be around for quite some time but X11 / Xorg Server as stand-alone display server is pretty much dead.