Reading left to right, there are six search functions followed by an index of categories and finally “new topic”.
For a “new to Kicad Forum” person, probably reading and clicking from left to right, there is quite some clicking and reading to finally find a category index. Using the terms “all categories” and “category” may also add to confusion and frustration.
Maybe a rearrangement is due, especially as there may well be changes to the “Category” shortly.
Also, regarding the Forum UI, the “optional tags” need updating.
There has never been a tag for 6.99. Now there is a 7.0.0-rc. Shortly there will be a 7.0.0 and consequently a 7.99.
Maybe it is also time to bid farewell to the 5_1 tag?
Looks like this can be changed. I set up a test bed to play with Discourse but not sure I have the time or energy right now to hunt down a setting that I don’t have the ability or permission to change. That said, sub categories visibility is the main issue at the software level.