With OneDrive for Mac OS, it is impossible to uncheck a folder in OneDrive preferences to unsync it UNLESS every single folder has finished syncing. This is ridiculous because if your disk space is nearly full, you cannot unsync a folder to save disk space because the folder is not done syncing. This gets you stuck in an impossible loop.
Here is a screenshot of the error message (sorry for the french but I will translate it).
here is the translation: "Certain elements that you are attempting to unsync are not yet on OneDrive. Please wait for the download to complete before changing sync settings, then try changing the settings again."
This just doesn't work and is causing me a lot of problems.