@User Note that making your thing overwrite would be more correct. In that way you would no permantly unregistere the core save button, but instead your thing would take its place if its going to be shown. This is relevant if you added conditions to yours. I hope that helps, and that is also what the Seo toolkit does. Read more here: https://docs.umbraco.com/umbraco-cms/16.latest-rc/customizing/extending-overview/extension-registry/replace-exclude-or-unregister