By default, iCloud for Windows stores your synced files in folders inside your username's path, which in most cases resides in disk C. In my case, for example, iCloud Drive's folders and files were copied to folder C:\Users\falomain\iCloudDrive when I enabled the iCloud Drive option after installing iCloud for Windows.
Although I have plenty of space on my C drive, I prefer to keep all my personal content on an ever larger drive H, so I extrapolated Kalibur06's method of moving Photos to the case of Drive and it worked perfectly. This is what I changed on
Kalibur06's steps:
Origin folder: "C:\Users\falomain\iCloudDrive"
(Note: do NOT type the space between iCloud and Drive here)
Destination folder: "H:\iCloud\iCloud Drive"
(Notes: I have read on distinct places a recommendation NOT to place iCloud's sync folders directly in the drive's root, e.g. H:\iCloud Drive"; you can freely use spaces in folder names here)
IMPORTANT: If you later decide to move your files to a different location, use the iCloud's default as Origin folder and change the Destination folder only. In fact, you can continue to use the default path to access your iCloud Drive files because Windows will 'mask' the physical (destination) location with the original path, although storage space will be actually taken from the destination drive.
My thanks to @Kalibur06 for the excellent article.