An SF cluster resource is made up of other Azure resources that you pay for. Therefore, so that you do not charge a fee, you will either have to delete these resources one by one, including the cluster resource, or simply delete the resource group that will delete all the resources under it.
If you have other things in RG and you want to save them, you will have to delete resources that support the SF cluster, they are all marked with two tags 1) clusterName: your cluster name 2) resourceType: Service Fabric
you can use those that narrow down the resources you need to remove.
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