Calibreserver issue using Book list mode/Custom list

If the Calibreserver is started from the running Calibre program it works like a charm. (where that modified json custom booklist template is stored I cannot determine.)

However I have problem applying a custom layout in Calibreserver when I launch Calibreserver from the Linux prompt. (bash)
I tried applying the server-custom-list-template.json
in my settings in the Linux profile: /home/phkpr/.config/calibre/resources and applying it in /opt/calibre/resources... but no result.
It keeps displaying the default/unchanged layout.

Any idea how to handle this.?
Thnx!!!