I'm not sure if you are asking how to change the connection path or why a specific connection path is selected.
To answer the first part, how to change the path, the Computer and Connection Point sections of the dialog can be used to change the Path to reflect your selections.
The default domain controller that is shown in the dialog, will be based on the AD Sites and Services configuration and which IP addresses are assigned to an AD site. You can you this option in NetTools to determine which AD site an IP address has been assigned to and this option to determine which sites that DC have been assigned to.
Gary.