Permalinks not working

Hi,
I searched the forum, but didn’t find a solution.

When I create a new event, the displayed link is a “pretty” permalink.
When I open the new event there, the layout is exactly what I want (blog post)
e.g. /termine/project1/

When I open the same event from the main list page I get a different layout
This is because the link there displaes the event-id (no the permalink)
e.g. /termine/?event_id1=22718

I changed the wordpress permalinks settings a few times without any effect
(setting ist postname)

Is there a possibility to change this?

(If not, I found a workaround with brings another problem:
How can I remove a “read-more-link” on the event list entry)

Many thanks for your help!