User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:72.0) Gecko/20100101 Firefox/72.0
Steps to reproduce:
I am having trouble organizing bookmarks in the bookmarks window in FF 72.
If I click on one bookmark in the list, the bottom section expands to cover 1/3 of the screen, and everything jumps about.
Part of this is because the bottom section for bookmarks is so much larger than the bottom section for bookmark folders. But in my opinion, they're both too large, since they make it harder to navigate.
If there is a user setting to fix this, I can't find it. The new about:preferences is hard to read and hard to scroll, and searching there for "bookmarks" doesn't show any relevant preferences.