Lenz checks the draft you are writing. Open Extensions → Lenz Fact-Checking → Check this Doc: Lenz reads the current tab, checks the factual claims it finds against independent sources, and checks whether each cited page says what the draft attributes to it.

To check one part of a long Doc, select it and choose Check only the selected text.

The findings appear in a sidebar: issues first, then what checked out, each group in the order of your text. Click one to select its words. Where Lenz suggests a correction, you see the old and new wording side by side, and Apply makes that one change; nothing in your Doc changes unless you click.

The first time you check a Doc, you allow Lenz to read that Doc. A check takes two to four minutes. Lenz receives this tab's text to check it and keeps the check in your Lenz account. Deleting your account deletes it.