Hi Mike,
I hope you've been well since our last conversation a long time ago! Here's something to look at. Maybe it will help. There are a lot of suggestions online if you google "OneDrive hijacks My Documents." This is one of them:
https://superuser.com/questions/1675...ed-by-onedrive
The first response may work for youi. I found that location in my registry, and it has the correct placement for my My Documents folder. Let me know what you found at that registry location!
NOTE: There are two "fixes" suggested in the above site. The first for when you have uninstalled OneDrive, the second if you still have OneDrive and can reach its settings.