Book Traversal Links Section is Missing

When I initially installed this module (the 2.0.0-alpha1 version), there was a 'Book Traversal Links' section appearing below the book page content.

This was very helpful, as it allowed the user to quickly go from the current page to the previous or next page in the book tree...

However, for some reason, this is not appearing anymore. I've tested with the Olivero theme, along with DXPR (the normal default theme this site is using).

Now, looking at /admin/structure/types/manage/book/display, I am seeing "Links" as an active field item (below Title and Body). I assume that refers to the 'Book Traversal Links' functionality.

I also tried to see if this could be added via a block. But when clicking 'Place block' in the desired region, there is no option for this that I can see.

So I'm not sure how this is intended to be implemented, or why it seems to have gone away. But it would be great to bring this feature -- which existed in the old Core module -- back again.