How to disable switching user with Touch ID?
It’s not possible to just disable Fast User Switching with Touch ID without disabling unlocking with Touch ID. However, it should be noted that the action of switching user with Touch ID is with a press of the Touch ID button, whereas a fingerprint read for the purpose of providing authentication is with a rest of your finger.


When prompted for Touch ID for authentication, such as by 1Password or a system dialog, rest your finger on the Touch ID button. Don’t depress the button.
When you want to use Fast User Switching, when no prompt for authentication is present, press down and click the button with your finger on Touch ID.


These are two distinct actions, with the former performing no action if there is no active prompt for authentication requiring Touch ID. Therefore you won’t inadvertently perform a user switch.