hput via "Announcements and discussions for GNUS, the GNU Emacs Usenet newsreader (in English)" <info-gnus-english@gnu.org> writes:
[...] >> See >> https://www.gnu.org/software/emacs/manual/html_node/gnus/Group-Levels.html > > Er, and what am I to learn there? > Ahh I found what I was supposed to learn there. How to list groups by level. After trying a few levels it appear that all or maybe nearly all my groups (mail and news) are on level 3 `A l 4 <RET>' makes ever thing disappear ditto for `A l 2' They all seem to show up with `A l 3 <RET>' I'm thinking that means that levels are not playing a role in the oddities I've described.