Thanks, I see that now. I appreciate your efforts in answering my questions.
I had the same issue with the course format "collapsed topics" used together with "show activity completion" in the latest Moodle 3.11.3 (Build: 2021913). I could only could use one or the another as Rick mentioned. Thanks to Gareth there is a newer version of the plugin "collapsed topics" (ver. 3.11_2021061201) which solves the problem. Now I am happy again😄 This also works with the Fordson theme.