OS: Windows 10

I am new to python (and programming) and use this tutorial:
https://youtu.be/_uQrJ0TkZlc?t=14055

My problem starts at the time-print by installing openpyxl via pip: I can install openpyxl sucessfully but after that I can not use it via:

import openpyxl
I get:
ModuleNotFoundError: No module named 'openpyxl'

Now the video shows me the path where openpyxl should be installed:
-External Libraries\Python 3.7\site-packages library root\site-packages
where it should be: https://ibb.co/vH1cCXY

But my library root is:
-External Libraries\Python 3.7\Python library root
And so I find openpyxl inside:
-External Libraries\Python 3.7\Python library root\Lib\site-packages
The folder site-packages and its contents are red.
where it is instead: https://ibb.co/ydBbSGP.png

Somehow my library root is not set correctly. But I can not find a solution.

This Question is similar to: Pycharm site-packages folder marked red and modules cannot be imported

So I checked my interpreter setting but can not find anything noticeable:
interpreter setting: https://ibb.co/bvg7fCb