By default, all locations are assigned to a cluster. To exclude a specific location, simply deselect the 'Included' checkbox—this will remove it from both the cluster and the selected Automated Cluster Group.
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For more granular control over location exclusions, you can utilize location filters during the creation process. This filtering option allows you to exclude specific locations based on predefined criteria through the filtering on Automated Cluster Group creation. While these filtered-out locations will remain visible in your Automated Cluster Group list and maintain their cluster assignments for reference purposes, they will effectively be excluded from active participation in your Automated Cluster Group calculations and operations. When you need to add this location back, you can click on ‘Included’ to have this location part of your Clusters and Cluster Groups without having to create a new Cluster Group.
Read more on the help article here.