Jupyter lab installation and data path

Hi more-experienced users,
after lots of tries and fails I finally installed jupyter lab successfully. The reason is that it is uses in the openSAP python for beginners course. They supply the notebooks for download,
For whatever reaon, jupyter got installed in %SystemRoot%\system32. From there I start it as "%SystemRoot%\system32\WindowsPowerShell\v1.0\powershell.exe " jupyter lab
I downloaded the stuff from Python for Beginners | openSAP and dragged it into the sidebar where I created a directory named PythonCourse.
I’d rather like to work in another directory, best an another disk drive. I copied the stuff to another path on another drive but i don’t know how to open it because all should be relative to /jlab/root/ - whatever that means.
OK, admitted, it’s my first try to work with windows 10 powershell ans jupyter lab.
Which material could I probably consult?
Thanks a ton, Clemens