I really dislike and do not need OneDrive, but it's baked in to Windows 10. The best we can do is hide or disable it, but it's not that easy. Though I uninstalled OneDrive in Control Panel, and turned off every activation instance I could find, the program still persists in stashing my stuff in impossible, secret places — not on the Microsoft Cloud, but in OneDrive folders it creates on its own initiative. I've just discovered that all my desktop content is squirreled away in a OneDrive folder, not in Windows/Users/me/desktop. It's infected Outlook, adding unnecessary "(this computer only)" status to all my folders. Several third-party programs default file-save only to new OneDrive locations.
A long email exchange with Microsoft support led to this "fix": Delete your Microsoft account, even though this will kill all purchased apps from the Microsoft Store, delete all Skype credits, remove me from all support threads, and possibly disable my phone — among other warnings. In an hours-long phone conversation with Microsoft — the company has NO OneDrive support team — a supervisor apologized for none of his agents having been trained in OneDrive, though he advised against such radical surgery.
We reinstalled OneDrive and its App. Still, the blue or white One Drive logo did not appear in the taskbar to enable a disable. Then, on clicking Sign Out in the app, Microsoft's streaming dots simply squirmed around for hours without accomplishing the task. I've spent hours with Microsoft on this issue and all I got was a useless case number — but no fix. If anyone can wrestle this gawd-awful program into submission, it has to be Tweaking.com which has saved my bacon in other ways.
Fingers crossed.