The Notes app uses a single password to protect all notes on your device. There is no option in the Notes app to use multiple passwords. In addition to the password, the Apple Notes app provides the option to protect notes with Touch ID, which allows you to open protected notes with Touch ID even if you forget the password. To Lock Apple Notes with Password: ..
Steps to create password for Notes app in Settings
If you can’t remember your password, try one of these password hints. ..
If you have a newer iPhone, you can use Touch ID or Face ID to unlock your phone. ..
Steps to lock note in Notes app
To unlock a note, open it and press the button on the back. ..
Final Words
If you want to keep your notes secure and private, then you should use a password to lock them. This will make it difficult for others to access your notes without your permission. You can also choose to encrypt your notes with a password before locking them. This will make it even more difficult for anyone else to access your notes. ..