Hi @rhywun
PySide6 i C++ library with bindings to python, there is no source code or docstrings (in term of Pycharm way of thinking).
I’m parsonally using Zeal - Offline Documentation Browser
You need go to menu Tools / Docsets and in Available tab search for Qt6
But PySide6 documentation is for C++ so you need be creative to translate to Python, anyway it kind of work.
Is not that bad, with python package there are *.pyi files (kind of headers files for python) with classes and methods, so PyCharm is still able to aout-complete.