No, templates using our newest Design Elements are not compatible with Classic SharePoint pages. Since these elements are built on a new development architecture designed exclusively for the Modern SharePoint Framework, they do not work in the older Classic environment. To prevent errors and ensure system stability, these specific elements are not accessible in the Page Builder menu when you are editing a Classic page. The system automatically filters them out, meaning you will not be able to select, insert, or render them unless you are working on a Modern SharePoint page.