Hey Donald,
There is unfortunately no way to limit the recurring events display in the admin.
There are two details that may be helpful, though:
1. First, you mention the event “never ends.” If this is truly necessary, then of course keep this “never-ending” configuration in place! However, if you can make do with a finite series of events, then limiting the events to a finite period would, of course, reduce the volume of events in the admin. Again: this may not be a helpful tip, because your series may truly be never-ending (or at least “indeterminately-ending”). But I just wanted to touch on this in case it’s handy.
2. As you add other events, they will populate the admin, and will be interspersed in the admin amidst the recurring event instances in that never-ending series. So as you add more events that have other dates, etc., things may be a bit simpler to navigate.
I hope this is useful—let me know if there’s anything else I can try to help with!
George