Ed, I've noticed the same thing happening to me for quite a while.
In addition to Ed's problem on his notebook with Firefox, this is happening to me using Chrome-based browsers (Brave, Iridium & Microsoft Edge) on a 1080p monitor. This also happened before upgrading to 3.32.0 recently.
I have a folder (gallery) that has 42 subfolders.
When any gallery (i.e. not the home page) is selected, for example HERE
, if I try to display the content (subfolders) as shown in the attached screenshot, in the folder (column) on the right, only the first 24 (out of 42) subfolders are displayed, as shown in this screenshot:
I am able to scroll down slightly, to display an additional 5 subfolders, in which case then the first 29 (out of 42) folders are displayed, as shown here:
This problem does not really impact me, as this X3 site is for my own use only, and when this problem happens I know that I can just go to & select the parent folder, at which time all 42 folders are displayed. But I can see where this would be a problem for people who use their X3 sites for professional reasons.
I do acknowledge, however, that I myself might be the cause of this happening to me in my case, due to some Custom CSS that I'm using on this X3 site for other things, but that might be causing this problem.