You can uninstall OneDrive like any other program - go to Settings / Apps and Features, and then finding it in the list of apps and taking the uninstall option.
Regarding your Documents and Desktop folders ... if you right-click on Desktop in Windows Explorer and then look under the Location tab, it will tell you the physical location of that folder. It defaults to c:\users[username]\desktop, BUT if you have opted for OneDrive's so called automatic backup (which is nothing of the kind), then OneDrive may have changed the location to itself - i.e. c:\users[username]\onedrive\desktop. If that is the case then you need to move the desktop folder back to the default, or to some other location outside OneDrive, BEFORE uninstalling OneDrive. To do that, in the Desktop folder properties window, click Location, then Move.
Same goes for the Documents folder.
Please note that uninstalling OneDrive does not delete your data held on the Onedrive cloud. It simply removes the Explorer "plugin" so that you cannot directly access OneDrive as a folder in Windows. But if you go to https://onedrive.live.com and sign in, you'll see all your files are still there.
Sorry, I have no idea whether it's possible to uninstall OneDrive for one user and leave it installed for another. Knowing Microsoft, it might work or it might not. My advice would be to uninstall it for all users, and use a free Dropbox (or other similar cloud) account instead. That's what I did, and it is the only way, it appears, to get rid of these stupid prompts.
All the above applies to Windows 10 - haven't a clue what happens in 11.