How do I delete a single chapter from my book?

From version 1.9.18, open the book, move the mouse over the chapter in the manuscript list and click the bin at the right end of the row. BookyAI asks you to confirm. The chapters after it are renumbered automatically, and everything that refers to chapter numbers follows: the headings, the version history, quality reports, fact checks, the index, and the audiobook files if you have them. The chapter is removed from the translated editions of the book too. The text of the deleted chapter is not thrown away: it is kept with the book and can be restored. In earlier versions a single chapter could not be deleted.