Jupyter shows nothing, no files, no filder

I don’t believe you issue is the same one as in this thread.
The issue with Jupyter being unable to access files in the cases where users have OneDrive involved, using the typical default OneDrive settings, is well documented on this forum. Please see here and the last paragraph of my reply just above there where I say:

That should you lead you to there and posts after that one discussing the problem and solutions.