I don't think Pycharm will install different versions for you, but if you have multiple versions installed, it is indeed super easy to switch between them. Though if you have a ton of packages you'll have to reinstall them all for the right version, and if you're dealing with lots of venvs + system installs, you have to make sure to choose the right thing from the dropdown and you might get somewhat lost and confused if you don't know what you're doing.

The right menu is File -> Settings -> Project: <your project name> -> Project Interpreter, and then you pick whatever you want by Python Interpreter.

In Windows I use Chocolatey to manage Python versions, in Mac idk though.