Uninstalling ePO - On-prem from a cluster environment requires that you take specific steps, depending on which server-class operating system you are running.
To set all ePO - On-prem services to offline, open the Windows Cluster Administrator/Management tool, then click Start → Programs → Administrative Tools → Failover Cluster Manager.
In the ePO - On-prem application group, right-click each of the ePO - On-prem resources and select Delete.
To uninstall the software, click Programs and Features → Trellix ePolicy Orchestrator-On-prem → Uninstall/Change.
Repeat this task on each node in your cluster.