To remove a co-author book, you go to the same page where you added them as a co-author:
https://leanpub.com/YOUR_BOOK/authors
...making sure to replace YOUR_BOOK with your book's unique web address.
Related Article: How do I add a co-author to a Leanpub book?
In the list of authors, you will see a "Remove" link next to your co-authors:
Click the "Remove" link and you will see a warning like this:
Click "OK".
This will remove the co-author from the book.
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