Maybe I should add some background to this. I've been back and forth with Author Central already. I originally had "Book Title (Series Name, Book One)" in the title field of my paperback. Amazon rejected it, saying I needed to remove the parentheses or upload a new cover that included that part on the cover. They said the parentheses part was redundant, and that it would be added to the title automatically. So I removed it and hit publish. Book goes live with "Book Title" and that's it. Meanwhile, my Kindle version has the full thing. I emailed back and asked them to fix it so the paperback has the full thing, they said sorry, can't do that. Paperback title is not editable after publishing and my only option is to unpublish/republish. And that title field is now locked for me in KDP.
Maybe I'm being nitpicky, but it's my darn book and I want the title to appear how I want it to appear. As it is right now, the paperback looks like a standalone. I just don't expect readers to scroll down and read those details to see it's part of a series.