Hi, yes, this "more.." is also bothersome, because it does not lead to a "second page" as you suggested, but to a complete overview of all courses (which I do not want my students to see).. but that's another topic.
I have now found the solution to my problem (unfortunately it's a core hack...)
https://github.com/moodleuulm/moodle-local_boostcoc/blob/master/README.md#list-completeness
Thank you all for your time and for your comments!