completely uninstall istio

#To completely uninstall Istio from a cluster, run the following command:
istioctl x uninstall --purge
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#Alternatively, to remove only a specific Istio control plane, run the following command:
istioctl x uninstall <your original installation options>
#Or
istioctl manifest generate <your original installation options> | kubectl delete -f -

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#The control plane namespace (e.g., istio-system) is not removed by default. If no longer needed, use the following command to remove it:
kubectl delete namespace istio-system
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