Problem: How can I remove users from 'Assigned To' list in Service Desk?
Cause: If a user is associated with SD Admin and/or SD Tech Role and Scope, he/she will be included in Assigned To list.
Resolution: To remove user from the list we would need to remove SD Admin or SD Tech Role Types from their User Role or remove the Role which has this Role Type from that User.
This can be done by Navigating to System > User Roles.