Change Touch ID preferences on Mac
If your Mac or Magic Keyboard has Touch ID, use Touch ID preferences to enable your Mac to be unlocked with your fingerprint, and to add one or more fingerprints to your user account. You can also enable Touch ID to be used to make purchases with Apple Pay and from the iTunes Store, App Store, or Apple Books. Learn how to use Touch ID.
To change these preferences on your Mac, choose Apple menu > System Preferences, then click Touch ID .
Add a fingerprint to the current user account. To rename a fingerprint, click the text below the fingerprint, then enter a new name.
You can add up to three fingerprints per user account (your Mac can store up to five fingerprints total).
Unlocking your Mac
Unlock your Mac with any fingerprint added to the current user account.
For security, you need to enter your password when you start your Mac.
Approve Apple Pay purchases using Touch ID.
iTunes Store, App Store & Apple Books
Make purchases using Touch ID in the iTunes Store, the App Store, and in Apple Books.
Use Touch ID to automatically fill in user names, passwords, and credit card information in Safari and other apps.
Use Touch ID sensor for fast user switching
Switch between Mac user accounts using Touch ID.
To switch accounts using the menu bar or Control Center, see Switch quickly between users.