Orchestrator cluster management includes adding and removing nodes to the cluster. You can remove an existing node from an Orchestrator cluster to replace it with a new one or to reduce capacity.
To remove a node from an Orchestrator cluster permanently, you must power off the Orchestrator appliance and delete the virtual machine that hosts it. For more information, see the vSphere Virtual Machine Administration documentation. After that, you must edit the load balancer configuration to delete the entry for the Orchestrator node that is no longer available in the cluster.
If Control Center shows nodes that are no longer part of the cluster, access the advanced Orchestrator Cluster Management page, at https://your_orchestrator_server_IP_or_DNS_name:8283/vco-controlcenter/#/control-app/ha?remove-nodes to remove the leftover records.