In Catalina, Can Fingerprint Replace Password Requests on Preference
Yes, you can replace a password request on System Preference with Fingerprint also. 

You can also use Touch ID to unlock these features on your Mac:

•   Password-protected Notes

•   The Passwords section in Safari 
preferences

•   System Preferences 

Note: If you have FileVault turned on, you must type your password to unlock the Security &amp; Privacy pane and the Users &amp; Groups pane. 

•   Just make sure that you have enabled all the checkboxes to select the Touch ID features that you want to use on your Mac.