Book Access permission missing D9

I, too, have a similar issue.
on /admin/structure/book/settings
I saw settings, and also the note "These are the default access rules for authors and roles. Users can only be specified on a per-book basis."
I have not yet figured out where/how to set users on a per-book basis.

I just installed this module on a D10 site. Same issue, no Book Access tab on the Books. Thanks.

I took a look at the code base for this module to see if I can figure out what the problem is. I don't see a .links.task.yml file or a .routing.yml file. Correct me if I'm wrong, but I think those are required to add a tab to the Local Tasks tabs at the top of a node page. I see a lot of empty functions and commented out code. So, I guess my question is, does this module actually work or just a placeholder? You may want to add something to the Module page about D10 progress or where this module stands as far as functionality. Thank you Maintainers for your continued support of this module, it is a vital piece of a website I am migrating from D7 to D10.