Password protect
It would be great if you had an option to password protect a selected notebook in case you have to create one that would contain sensitive information.
CGPlenty
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Introducing Password Protection for your documents
To lock a document, tap on the context menu for the document in the library view and set a password. Anytime you try to open, export, duplicate, or delete the document, Goodnotes will ask you for the set password. If you’re using a device that supports FaceID or TouchID, you can use these instead of your password to unlock a document. Please note that you can have only one password that will apply to all locked notebooks and that Password Protection is only available in Goodnotes 6. Learn more
Update to version 6.4.2 in App Store to use Password Protection.