How do I re-run the originality evaluation for a chapter?

Open Quality from your book's workspace. On each chapter card, in the Originality section, you'll find the button: Check originality if the chapter has no score yet, or Re-check if it already has one. One click re-evaluates that single chapter's current text. To re-score the whole book, use the Check originality button at the top of the page — it evaluates every finished chapter, including ones that already have scores. Tip: the Rewrite for originality button already re-scores the chapter automatically after rewriting it.