The new organizations/users API access all users when the requesting user is a staff user. This makes the Course Editors filter unusable since we'd have to either fetch all users to the front end, or implement the search against the list on the back end. For now the approach we'll take is to simply remove this option for staff users (this feature was intended for course teams anyway).
remove front end filtering on Course Editor when the end user is a staff user
leave default backend pagination as is