Thanks a lot for your help!! It took me a while to find the OneDrive settings icon (had to start in the "hidden icons" area, but finally found it and "unlinked." I felt better the moment I "unlinked"
Purely for my edification, can you tell me why I would or should
WANT to be linked with OneDrive? I'm sure I must have clicked on something that gave (whoever) permission to copy my files to the cloud. I would rather it had been something to opt into rather than having to opt out.