In Windows Explorer, how to make Libraries point to D: drive?

Bought new computer with 256GB SSD C: drive and 4TB D: drive. Setup and data transfer by Staples tech put everything on the smaller C: drive. I worked hard to move as much as possible to large D: drive, as C: nearly full. I placed my Documents, Music, and Pictures files on D: drive.

I very much want the Windows Explorer Libraries to point to the appropriate folders on my D: drive. I presume that I can change some Registry entry or perform some other manipulation to bring about this switch. How?

In a forum post I read that the path to "hidden" libraries is
C:\users\(user-name)\appdata\roaming\microsoft\windows\libraries

I get as far as Roaming, and the only folder there is Intel\Wireless\Settings, where the last folder shows "This folder is empty." I cannot get to the rest of the tree. If I could then I might find pointers to actual folders that I could change as desired.

Because certain things were preinstalled, and their locations are presumably locked into the Registry, a Dell support person told me that I absolutely could not change their locations. So I would want the Win Explorer Libraries to display the default stuff plus my D: folders.

Is this asking for too much?