I can’t really recreate this in my tests. Probably a specific issue with that specific element.
Have you tried adding your custom class, clicking outside the design panel and then going back?
It does work but for some reason clicking outside the design panel then going back to it only seems to work if I’ve added 2 new classes and not one
Sometimes, I don’t even have to click outside the design panel to be able to edit the vales but again this is only if I’ve added 2 classes not one
So it seems just adding one class doesn’t seem to allow me to modify locked values
I can confirm that this is happening with other elements with locked values as I just tried it on the page component which has locked values in Framework7
I did find an old post where someone faced a similar issue, however they were able to solve it by doing as you suggested above by clicking outside the design panel and going back after adding a custom class whereas for me, this only seems to work only after I’ve added 2 custom classes: