How to reconnect my previously downloaded Xbox PC games to a new Install of Windows 10/Xbox...

I reinstalled Windows 10 on my PC and and had to redownload the Xbox App. My Xbox PC games are kept on a different internal hard drive. And the newly downloaded Xbox app does not see the already downloaded games. How do I point the app to the location where all my games are already downloaded from the previous version before? Doing this with my Steam account and games was real easy, but I can't seem to figure it out with the Xbox app. Any help would be appreciated, thanks.

:)