How do I edit or regenerate the Preface, the Introduction, the Glossary or another front or back matter section?

From version 1.9.15 these sections are in the manuscript list of the book, like chapters: "Front matter" above the chapters and "Back matter" below them. Move the mouse over a section and three actions appear on the right: "Instructions", Edit (the pencil) and Regenerate (the circular arrow). Edit opens the same editor chapters use, with Versions and the AI rewrite tools. Regenerate writes that one section again and keeps the previous text in Versions. A section you imported from your own manuscript has no Regenerate on its row, so it cannot be replaced by one click; you can still regenerate it on purpose from inside the editor. An Epigraph and a Foreword only have Edit, because BookyAI never writes them.