Hello! Well, setting the Dialog font would change the whole appearance of the UI, that's not what I intended. o)
I think it could make sense to also use the "Rename Macro Builder" font for creating folders? This font is forcing a fixed width font to choose from, which always makes sense when things need to line up when editing file/ folder names, which is of course is also the case when using "Create Folder" to enter multiple new folder names.
Using the "File Display" font would work for me as well, because I use a fixed font there as well. This is "Cozette Vector Medium", it does not look so clunky as many other fixed width fonts (it actually does not seem to be a fixed width font as "New Courier" is, because it's not listed when choosing a fixed width font, it still is fixed width though (it seems at least o).
Find the "Cozette" font here (I went for the file CozetteVector.ttf):