Are you troubled by the way Office M365 apps – Word, Excel, PowerPoint, Outlook – all save to One Drive by default, because that can get pretty annoying.
Fortunately, preventing this behavior is rather simple – and not as extreme as unlinking and uninstalling One Drive – which you may be using for other reasons (or not).
Open Word, then click on Options in the lower left corner
Click on Save in the left menu, then check the Save to Computer by default.
This sets the option for the whole office suite of products, though, I would double check the next time you use them.