The optional add-ons button is still full colour when deselected. This makes it confusing for the user as to whether it's selected or not. If you could default it to 50% saturation of its original colour, that would make more sense. Or make it just go grey would work - and is pretty standard. I'm sure we can tweak all this fully once we get full CSS control (🙏) but until then, this would be much appreciated.