Resurrecting this post…
It’s a shame that even after all this time OpsManager is not able to do such a simple thing …

It seems the way is to completely remove from OM, do it manually via command line, then reconfigure in OM…

I still remember all the times I heard devs and devops guys praise MongoDB as not needing DBAs.
Hah.
You’re not going to need any less DBAing with this extremely limited level of tooling.

Can’t even change a replica set name…
OM is such a phenomenal idea… But the implementation simply leaves a lot to be desired.