You can delete roles.
If you delete a role, the permissions and operational administrative privileges set for the role are also deleted.
The Administrators role and the Everyone role cannot be deleted.

1. Click the Administration menu icon (gear icon) in the header.

   The gear-shaped icon appears only on the screen for the users with administrative privileges.

2. Click Users & System Administration.

3. In Users & System Administration, delete roles.

   For details, refer to how to delete groups.