Hi, I'm a OneDrive advisor and a OneDrive user like yourself.
The whole idea of OneDrive is to mirror the OneDrive folder on your PC with the OneDrive allocation in the Microsoft cloud so that anything you do on one is replicated on the other, including deletions. The only way to stop that is to unlink your PC from your OneDrive cloud in Settings>Accounts. If you wish to update the cloud, you can do so in a browser session at https://onedrive.com/. That way, what's in the cloud can differ from what's on the PC, but copying new files to the cloud will be a manual process.