high memory in App Info, clear storage nor available

Hello,
in the app information (“App Info”) of Locus Map on my Android phone (Pixel 5), a very high storage and cache usage is displayed. It shows that I have 9.08 GB of user data. The “Clear storage” button is grayed out and cannot be tapped.

I have deleted all downloaded maps and also cleared the map cache. Where can I find the 9 GB of data, or how can I delete it?
Two screenshots are attached. I cannot open the path shown in the screenshot. I am unable to open the “Data” folder.

Thank you very much,
Torsten