To uninstall Vault operator, run the following command:
In Helm 3, release names are scoped to a namespace. So, provide the namespace you used to install the operator when installing.
$ helm uninstall vault-operator --namespace kube-system
$ helm delete vault-operator
If you prefer to not use Helm, you can generate YAMLs from Vault operator chart and uninstall using kubectl.
$ helm template vault-operator appscode/vault-operator --namespace kube-system | kubectl delete -f -