John:
You can use the Attribute Manager to see the pens used in the project (I think this also includes pens used in the default settings of the tools). You can export a text file of the pens, but when I did this, the In Use column was empty.
You should add a Signature to your Profile (click the Profile button near the top of this page) with your ArchiCAD version and operating system (see mine for an example) for more accurate help in this forum.
David