OK, I understand.
My search for “state.name:closed” doesn’t find any closed tickets.
A search for “state.name:new” has one result only and finds the welcome ticket from Nicole Braun which is created automaticly within the installation of zammad. But I closed this ticket already, so I’m confused why this is the result of the search for a “new” ticket.
On the other hand there is only one open ticket in my test enviroment of zammad, which is found by the search for “new”. However this ticket still has no owner. Could it be that only those tickets closed/open/new are shown where I am the owner?