Hello,
I’m curious to know how I can display page structure in contango.
You should have control on WordPress Custom Menus to have any structure. Following Codex will be helpful to you,
http://codex.wordpress.org/Appearance_Menus_Screen
How do I get page navigation and page structure to show up in the page header
Technically it is know as Breadcrumb. I strongly recommend to use Yoast WordPress SEO plugin to enjoy this feature. But you have to implement Yoast Breadcrumbs code manually to your page as instructed by Plugin.
Thanks