Style list doesn't scroll down

After installing MuseScore 3.9.2.5315, I opened a song I originally created in MuseScore 2 and let it reset the position of all elements. Then when I went to the Format menu and chose Style, it wouldn’t scroll down below “Rehearsal Mode.” When I clicked on the window’s corners to resize it (and hopefully get a vertical scroll bar), it closed. I was then unable to do anything to my original lead sheet until I hit “Escape.

I'll attach a screenshot of the Format > Style screen, in which the column at left won’t show anything below “Rehearsal Mode.”