Python woes, works in CMD line, but not in PyCharm

Hi

So my first Python program, trying to get some data from a Siglent DMM

When I run CMD and Python, I can import a library called PyVisa, like this

import pyvisa

I can then connect and write to my instrument on USB

But, if I open PyCharm editor and write the same and execute, I get:

File "C:\Users\klaus\PycharmProjects\DCSweep2ndTry\main.py", line 1, in <module>

import pyvisa ModuleNotFoundError: No module named 'pyvisa'

So tried to look for pyvisa, but have no idea where is has been installed (did a search of the HDD, to no evail)

Any hints how to proceed?

Delete all programs and start again? (pyvisa is probably installed in a non typical way, in the Python environment, and I have no idea how to find it)

Regards

Klaus