You can run the arc-cs nodepools delete <cluster_id> <nodepool_id> command to delete a node pool.
For more information about this command, see DeleteClusterNodepool.
Example by using the Alibaba Cloud CLI
Sample request:
arc-cs nodepool delete caa73d115830746e0942c9554ecae**** npaf26367f491a4d3a8e5d9623ce43****No result is returned.