Corel Font Manager 2018 - how do I add subfolders to library automatically?

Greetings folks,

I just upgraded to CDGS 2018 and was pleased to see the addition (finally) of an integrated font manager that will work on newer operating systems.  BUT I was puzzled and disappointed that when I add a folder to my font library, Corel Font Manager does not seem to allow automatic addition of subfolders (i.e. recursive folders).  This is standard on just about every font manager I've ever used (who wants to manually select dozens of subfolders ad-tedium?).  

What am I missing?  Can I add subfolders automatically, or does Corel Font Manager not offer that basic option?

Thanks in advance for any sage advice.