Can I have a private collection within a public library?

Hi- It seems like the privacy settings are all or nothing. Is it possible to make your library public, but reserve one or more collections to remain 'private' or vice versa - have a private library, but make one or more collections public i.e. shareable/linkable for others?

I have some extensive collections on specific subjects I would be happy to be public, but don't necessarily want all of my library to be public. I'm thinking the only way around this is to create separate accounts - one public and one private. ????

That is correct -- public/private is all or nothing.

At the bottom of each "edit book" page there is a checkbox that says "Private book (this is a beta feature)". Don't use it. That feature either does not work, or is buggy and may hide the book even from yourself.

It would be too complicated, because books can be in multiple collections.