@dollsaturn It looks like the game isn't using OneDrive, so you don't actually need to deal with OneDrive at all. Your first screenshot shows you're working with the OneDrive Documents folder, which is apparently not the location of the Documents directory that Windows has set. Sims 4 will almost always use whatever Windows is using, in this case C:\Users\your username\Documents.
If you want to double-check the location of Documents, open Command Prompt (you can search in Windows) and enter this command:
reg query "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders" /v "Personal"
This will return the location, and as long as it doesn't say OneDrive, you can ignore anything having to do with OneDrive. You could also sign out of OneDrive entirely with no effect on your user data.
To open the correct version of Documents, first click This PC in the left panel, then double-click C, and open Users > your username.
I would suggest simply creating a symbolic link if you still want your Sims 4 folder on your secondary drive, since it's less of a change than moving Documents, but either approach should work.