Jim, I know … it just feels bad if I can answer my own question myself after this.
But I always have to consider if I (in the end) spend a lot of time in researching (without solution) or if my little research is enough.
However I think that this kind of feedback might give an idea of how some of the great features could be designed more clear for non power users.
Just telling you that because I hope you don’t think I ask stupid questions without thinking 
Back to topic:
You can try this one https://www.wi.msm.uni-due.de/lehre/lehrveranstaltungen/sommersemester-18/biso-3747/download/BISO_SS_2018_1_auf_1.pdf/
It’s the same document I am using for my case Remembering reading position