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This operation delegates endpoint execution to the workflow developer. The workflow editor will default to "Any", which will execute on any one of the selected endpoints, which will be randomly picked from selected endpoints or a specific endpoint where previous step may have executed. Changing this value to "All" to will result in execution on all selected endpoints.
Prior to FlexDeploy 5.4.0.1, this defaulted to Any and workflow developer would not have been able to change it.