Im using ttras for quite some years now and still a happy user. However I now got a few hundred feeds, and for some it would make sense to create subgroups. Just like every file browser can show a directory tree, I wish ttrss had something like that. And iirc ttrss already had such a feature or plugin in the past.
Maybe I just didn’t find the right spot to enable it?
Tldr: Is it possible to have nested category trees within ttrss? Ig yes, how to enable them. If no, is it possible to do as a plugin or does it require changing core functionality?