I've just updated to the newest version of PyCharm Professional using the JetBrains toolbox.
In the previous version, there was an option to add a Python interpreter inside of a Docker image or one configured via Docker-Compose. These were the last two options in the "Add Python Interpreter" dialogue box.
After the upgrade, these two options are missing. I can still see the remainder of options: Virtualenv Environment, Conda, System Interpreter, Pipenv, SSH and Vagrant.
I've already tried clearing the settings. I can see that both the Remote Python and Docker plugins are installed. I'm running on OSX.