In Create audio I can only scroll through my books one by one with arrows. How do I find a book quickly?

Update to v1.8.1 — the book picker now has a search box above the cover carousel: type part of a title or a genre and the carousel narrows down live. Next to it there's an "Only books without audio" checkbox, which hides every book that already has a narration render — handy when you're working through your library and only want to see what's left to narrate. A counter shows how many books match, and clearing the search brings everything back.