Network Pool details are no longer present in SDDC Manager UI after directly updating the vMotion/vSAN IP address on the ESX host.
VMware Cloud Foundation 9.1
Starting in VCF 9.1, network pools are no longer maintained for imported clusters, as Day-N operations on these clusters are not supported via SDDC Manager
Remediate VCF Domain Configuration Drift
"The synchronization workflow no longer synchronizes network pool associations for imported clusters. If previous network pool associations for imported clusters exist in the inventory, the sync operation on the domain containing these clusters removes these associations from the SDDC Manager inventory."