No, you did exactly what you were supposed to. Changing my username would have broken the code. Have you enabled your personal JS? It is disabled by default. If you have not yet enabled it, do so by editing your preferences. It is under the section "Advanced display options".
What am I suppose to click "show hidden categories?"
No, click "Enable personal JavaScript". The name of the type of script we are trying to use is "JavaScript" or "JS" for short.
I see them now!
But, what I also really wish is that you could choose what columns of icons in the category exhibition you would like to view them in, like what you do when creating galleries.
That seems unrelated, please create a new thread for it if it's needed or report it through Special:Contact
21EvanED155508 wrote: But, what I also really wish is that you could choose what columns of icons in the category exhibition you would like to view them in, like what you do when creating galleries.
Well, you can choose between most-viewed and alphabetical order. While custom orders might make some sense for small categories, I think it would be a nightmare for larger ones. You would basically have to manually maintain a list of every page in the category and manually keep track of the list's order.