People get all bent out of shape over the OneDrive app, and who can blame them? In the first place, many people don't yet 'get' what syncing is and how it works, and Microsoft isn't exactly generous with explanations. Second, the OneDrive is setup by default to sync as much as possible. It would be better if users would have the choice to enable it.
In addition, if you have Microsoft Office, it's setup to save all your Office files to OneDrive by default, which is not a bad idea by itself, but how about telling us about that?
In time you will understand the significant benefits of syncing files to your OneDrive. For now, let's stop the syncing to give you a chance to figure things out on your own schedule.
- Open the OneDrive app and turn syncing off.
- (If you have Microsoft Office) open any Office app and change the default save location to your own computer.
- Sign in to OneDrive on the internet ...
https://onedrive.live.com/about/en-us/ (in the United States)
and download any or all files from OneDrive to your computer. Be sure to download to folders that you can remember, e.g., download documents to the \Documents folder in your user account.
Here's where you might run into a problem: You may have different versions of the same file in OneDrive and your computer. You'll have to decide which one to keep, or you can keep them both (or all of them) by renaming them. (Example: myfile1.docx, myfile2.docx, myfile3.docx et. al.)