Search "user:LittleSchnitzel"

That's really a shame, this feature was what I liked about lichess the most. Thanks for your answer anyway.

Is there somewhere an option to make user created arenas visible (as they used to be, both in mobile app & in browser), or is this feature simply gone and the only way to get people into user created …

1/8 + 0 time control would be great, since there is currently no way to force people to berserk in "berserk only" arenas.