To check users (Student, Parent and Staff) of Smart School, go to System Settings > Users. All the users like Student, Parent and Staff can be see here and you can enable or disable them from login to User Panel. To enable or disable user click on toggle button in Action column.

By default you will see student list. To enable/disable staff's , select Staff tab, to enable/disable student, select Student tab and to enable/disable parent select Parent tab from top of the page.