I am using:
Swiss Knife 4.0.0
Plain Classes 1.0.7
When using “Advanced Settings tabs on the left side” there are actually 2 different Css Tabs.
The CSS Tab from Swiss Knife is not saving my code, when clicking “Advanced->Custom CSS”, the code is saved correctly.
The Frontend only shows CSS code applied in “Advanced->Custom CSS”.
Please see video: https://ibb.co/1zVv36S