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Relevant section: https://access.redhat.com/documentation/en/red-hat-virtualization/4.0/single/self-hosted-engine-guide/#Removing_a_Host_from_a_Self-Hosted_Engine_Environment The undeploy button is in the New/Edit Host window > Hosted Engine subtab.
The updated procedures for this bug are now available: https://access.redhat.com/documentation/en/red-hat-virtualization/4.0/single/self-hosted-engine-guide/#Removing_a_Host_from_a_Self-Hosted_Engine_Environment
Reviewed, fine.