Restrict shipping class does not work

Hi Marek, could you provide some more information regarding your problem?
The Allowed shipping classes select list shows the available shipping classes.
The Restrictions only take effect when you tick the Restrict shipping classes check box.
The you have to select the Shipping classes that you want to allow for the particular shipping method.

See also https://www.oik-plugins.com/oik-faq/restrict-shipping-classes/

I don’t remember anymore, I am sorry.