If you select a Room in dRofus is selected (that which is already linked to a corresponding Zone in ArchiCAD), then and you click on "Show in ArchiCAD" (see below):
You will then be taken to ArchiCAD, and (following an auto pan and zoom) your Zone will be selected and displayed as followsshown below:
This will apply applies only if you have the relevant ArchiCAD project (within which you have the Zones linked) opened.