After you assigned an Agent to a certain Build Group, you can remove it from this Group. You can either assign the Agent to a different Build Group, or return it to the Default Build Group.
> To remove an Agent from a Build Group:
In the Coordinator Monitor, select the Agent you want to remove from its Build Group.
Right-click the Agent or open the Agent menu, and select the Build Group... option.
In the Build Group dialog box, open the drop-down list and select either the Default option or another Build Group. Then, click OK:
The selected Agent is removed from its previous Build Group, and it is now available for all Agents that belong to its new Build Group: