Hi, I'm Rodrigo and I will help you.
If you enabled the OneDrive Backup option, it changes the location of the backed up folders on the computer, this may affect some games, since most of them stores the save files on the Documents folder.
Did you already unlink your account on OneDrive? If yes, please, open OneDrive and reconnect it, it will make it easier to fix this.
After entering your account, open the OneDrive folder, select the files you want to keep locally, right click and select "Always keep on this device". This will download the files. The files stored locally will show the green checkmark on the icon, confirming the sync.
Confirm that the backup option is disabled on OneDrive Settings > Sync and backup > Manage Backup.
Check the folder paths on File Explorer, right-click the user folders (Documents, Pictures, Desktop,) > Properties > Location tab. If it is not the default path (C:\Users(You user name)), select "Restore default" > OK. It will prompt to move the files, select no and manually move the files from the OneDrive folder.
If the instructions above does not reflect any situation on your computer, please share the screenshots for better understanding, so I can guide you to the best solution.