The Inactivate Users option is only available to supervisors and Web Link administrators from within the User Security option. The Inactivate Users option is used to quickly inactivate a group of users.
After the Inactivate Users option is completed, the selected users are inactivated (the checkmark is removed from the Active field in the User Security option, and the Single Sign-On permissions defined within the modern experience are removed, if applicable), and the users are then unable to log into the School Accounting System (or Web Link, if applicable).