Hello There,
Thanks for writing in! The Topbar, navbar and bredcrumbs are hugely part of the header. When using Pro and that you’ve created a header and assign it to a page or as a global header, the custom header takes over and the topbar, navbar, and breadcrumbs gets replaced. At the moment, we are currently testing the v2 elements for the custom header which would include breadcrumb element. This should be rolled out pretty soon as we are on its final testing. So please watch out for it.
The topbar by the way can be easily recreated in the custom header.
Hope this helps.