To delete a connection to a local or remote view, you can delete the connection completely using:

mutation {
  deleteClusterConnection(
    input: {
      multiClusterViewName: "myMultiClusterView"
      connectionId: "CW8ppOz5CUfabsT7zB5dKIRs05DqIHuR"
    }
  )
}

The same mutation is used to delete both local and remote connections.