All, I am out now.
After weeks of waiting for (1) Microsoft to solve that **bleep** product problem and most of all for (2) this team here providing use that "user experience" I cancelled my subscription. I moved to iCloud Drive and I am pretty happy so far. All my files are stored locally as well, unfortunately somewhere deep in my folder structure again. But that's is Apple. With a link as favorite I can live with that.
Apples office apps are ok, new to start with but doing their job.
I kept my OneNote with a "free" 5 GB package.
So, no money for Microsoft anymore.
No stupid explanations from @Ankita Kirti about that "great experience" or endless waiting for an answer from that arrogant team. I hope, Microsoft is deducting their salaries by the amount of users moving to other cloud solutions.
Bye bye Microsoft.
Bye bye arrogant OneDrive team.