EDIT: The issue has now fixed itself. The popup looks back to normal now.

In the Interface Designer, when clicking "Share" on a Page, there is no longer an option to share the page publicly. As such, there is also no longer an option to UNSHARE a page that was already made public.

What happened here? Is this a bug?

This is what the Share tab looks like as of today.

And this is what it's supposed to look like: https://community.airtable.com/t5/announcements/new-share-public-interface-pages-publicly/ba-p/189617