A long time ago in a galaxy far far away there was a switching mechanic in the site editor Top Toolbar that allowed you to load arbitrary content into the selected template, it looked a bit like this:

Later this was removed in order to focus more on the template editing experience.

However, with the addition of the Navigation panel, it once again becomes possible to load different items of content into a template, albeit via slightly different flow. There results an issue with the optics... it's a bit confusing when you go to edit your "Blog" page and find the subsequent title to be "Index":

It might make sense to restore the labelling from before, whereby users can interpret not only which template they're editing, but the content too.