See at a glance what is public
Some pages here are readable by anyone — course covers, product pages, the store. Most are not. That difference has always been real and always been enforced: a page is public because someone granted it, and that grant is what decides whether a logged-out visitor can open it, whether search engines are told about it, and whether it gets a preview card when shared.
What was missing was any way to look at it. Nothing in the product answered "what does the outside world actually see?" — the honest way to find out was to fetch the machine-readable site index and read the raw XML.
Administration → Published to the web is that answer, as a list. Every public page, its public address, what kind of page it is, whether its preview card is one you made or one drawn for it, and when it last changed.
Two things worth knowing about how it works.
It is built from the same list search engines get — not a second list kept alongside it. A separate list would eventually disagree with the real one, and the version people read would be the wrong one.
And publishing moves nothing. A public page keeps the address it always had. It was tempting to gather everything public into one section, but that would change every address — breaking every link anyone has ever shared, and throwing away the search ranking those pages have earned. Being public is something a page is, not somewhere it lives.
The list is deliberately read-only. Making a page public, or stopping it being public, stays where access is managed — on the page's own Access tab. One place to change it, one place to read it.