New Locked notes: hide selected notes behind an app passcode. Use "Move to Locked" in a note's menu, then open them from "Locked notes" in the overflow menu with your passcode. Locked notes are excluded from the list, search, tags, archive, the home-screen widget, and folder sync. The passcode is stored only as a salted hash on your device. This hides notes in the app — it isn't encryption at rest. No new permissions or network access.
