As an admin, it should be possible to mark a series as closed or archived, meaning that the series is no longer available as an option when scheduling new recordings.
Alternatively, an end date could be configured for a series.
For example, a series may be associated with a course delivered in a specific academic year. At the end of the year, the series is complete. Admin users should then not be able to schedule new recordings associated with that same series (as that is almost always an error).