The Maintenance Mode setting for external nodes is grayed out

We have about 40 external nodes in our Solarwinds Orion environment, and for some reason with the latest version the Maintenance Mode setting is grayed out from our Managed Nodes view for any of these selected nodes.  Did something change with this latest 2020.2.4 version where external nodes can no longer be changed from Managed or Unmanaged?  Please advise.  Thanks!