Continuous view (horizontal) scaling problems?

I updated Musescore 4, and attempted to open a file I had been working on, and the horizontal continuous view has so, so much space between five of the instruments, while the bottom of the score is normal. When I clicked on the barlines to adjust height, it broke further, making the space about 10 times larger. Page view and continuous vertical both don't have this problem. I think the file might have been made in musescore 3, as other old files had this problem, but not musescore 4 files. Help!