When I try to deploy a configuration for all users of a domain (a Workgroup, not an actual domain,) old, non non-existent users are displaying in the Execution Status view. This means that the status never moves to "Executed." Is there a way to remove users from the Workgroup?

I attached two screenshots for reference. The first is the configuration being set to deploy to users of the Domain "Workgroup." The second is the Execution Status of that configuration which includes users such as "bob" and "Computer" that no longer exist. Because of that, the Execution Status will forever read as "In Progress." I'm trying to remove the historical users "bob" and "Computer" from the Domain in DesktopCentral.