Clusters can be scaled along the possible scale units in the Cluster Settings page. Assuming you have an existing cluster, click on the cluster name in the left-hand menu and click on Settings in the sub-menu that pops out. Then, simply click Edit scale unit and use the radio buttons to scale. 

Please note that scaling a cluster down may require changing the desired number of replicas. For more information, please see the how-to guide in the Documentation.

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