'Showing only user-created category (not maintenance categories)

I've spent some hours trying to understand how to sort out my categories: I'd like to start from checking categories with 0 or 1 article inside.

So I've tried to visualize only the most important categories of my wiki but I found out that it's not trivial. I tried to set the content of some categories to HIDDENCAT but they still get listed in the Categories Special page (click to check on my Wiki).

I understood that the functionality is not working as I was expecting so I am trying to look for some help.

How can I implement (develop) a filter to the shown categories?

phpmediawikimediawiki-extensionsmediawiki-installation


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