You know, I've noticed that the intra-page templates do not always match/map what you'd expect them to. It's easy to miss.
IMO what Studio probably ought to do (and sometimes seems to, for components like header/footer) is provide links between the sub-pages/components. That way when you load up "Blog Article Page" page in Studio, you'd be able to click through to the appropriate sub-component if it's available for editing. It took me a couple tries to land on the right one in the list too.
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