Directly related to this previous issue: Furigana options are gone
Only this time they aren't completely missing but the menu has moved and is almost unusable instead (the former isn't the problem.) The menu is very small and cannot be scrolled. What is invisible in screenshot is unusable in browser.
I first noticed this issue in
rev 2017.8.4.26700 but it's also possible that some earlier version broke the options menu.