Thanks Kris.
That’s what I thought at first, but when I specify a FA icon name from that page it doesn’t display eg: “fa-paw” appears as a blank space, as did the other FA icon names I tried. Whereas if I choose “book” it works.
This is the context of it’s usage, in case that helps:
api.onToolbarCreate(toolbar => {
toolbar.addButton({
id: "id_goes_here",
group: "extras",
icon: "book",
title: "Title_Name",
perform: e => e.addText("Test to add to compose textbox.")
});
});