You can now create a Notability password to lock subjects within Notability for iOS and Mac!
Notability's password will automatically sync between iOS and Mac even if you don't sync notes across devices.
Notability supports your device's Touch ID, Face ID, and Passcode. You can toggle this on for iOS in your Notability Settings menu under the Password tab. Similarly, you can turn this on for Mac in your Notability Preferences menu under the General tab.