Wherever you look at a domain, it now says the same thing. Connected services on the domain's DNS page says what Mail is doing (receiving mail at Magpie, how many records are found, or mail at another provider) and lists every website, Store and Link-In-Bio List at an address under the domain with whether it is Live, Not live yet or has a Problem found. The domain's Mail page has a new band, DNS and websites at the domain, with where its DNS is and the same rows. A Custom domain page now says, under its steps, where DNS for the domain is and so where the records go. The list of domains shows how many pages each has.
Connecting a whole domain such as example.com to a website, Store or Link-In-Bio List now also answers at www.example.com and sends visitors to example.com. It is on by default, has its own record and state, and can be switched off on the Custom domain page. Connecting www.example.com offers to send example.com there too.