This thought just occurred to me as I glanced over a notification that came in on another thread ("...there does not seem to be a way of seeing exactly which layout is in action for a page, even by inspecting the code." Source)

What about a new little icon in the admin menu that either links to a separate page or has a little dropdown info pane with details about the current page you are viewing?

home___pr_1782_backdrop_backdrop_testing_site

For example, all in one place, info (and potentially links to edit/adjust) about the:

  • Layout used on this page
  • Theme
  • Content type
  • etc.

That may be overkill but thought I'd throw it out there to see what people thought.

GitHub Link: 
https://github.com/backdrop/backdrop-issues/issues/2626
GitHub Issue #: 
2626