My very old script, from 2019 or so, still works, it was part of cH' (CoopHopes) map pack long ago...
For people who have a lot of custom maps, this helps as it can preview multiple columns of content.
Thankfully, Sauerworld won't let me attach 2 KiB file because file extension is '.cfg', link:
Download raw, use Git from command line interface, edit if you want to:
https://git.lain.church/xolatile/sauerworld-screenshots/src/branch/main/custommapsmenu.cfgHere's the preview:

Enjoy cooping...