How to purge OneDrive from the default user folders

Hi. I got this PC a while ago and OneDrive just kinda set itself up based on my Microsoft account. It was decently useful having access to my OneDrive files as a folder on my PC but I do NOT want it backing up my files automatically, partly because I want those to be offline and because I really don't need constant popups telling me I named my file wrong or that I ran out of space. So, I disabled synchronisation for those folders - I'm talking about the default documents, images, etc. folders. Yet there was then two seperate folders called Images (or whatever that folder is called in English Windows), one with the path 

C:\Users\cherr\Pictures,

and one with the path 

C:\Users\cherr\OneDrive\Pictures.

Explorer sees the top one as the default, and displays the shortcut to that in the bar on the left, while other programs such as my very old Canon document scanner's user interface sees it as the bottom one. I tried everything I could think of, including cutting the OneDrive folder and putting it in a different location in order to not lose any of the files), then renaming it. Yet somehow the scanner software and others, even if I manually select the correct folder, still default to the new path which is now

C:\Users\cherr\piss off onedrive\anything but OneDrive\Pictures.

I have had to turn off the OneDrive app altogether, which is problematic as I am also logged into a school account on that (which has caused zero problems) to which I need regular access for the files on it. Yet even this does not fix it.

Please help me out with this, as I now have two seperate folders called "Pictures", which are defaulted to depending on which app I am using.