If you're using the newer framework then you're using the newer Winforms designer most likely. AFAIK there isn't a way to disable this. But there are quite a few "formatting" options around the IDE so you could try disabling them all but I don't think it would matter. Settings include all the auto-formats, the editorconfig, etc.
If you're using NET 4.7.2 and not the preview winforms designer then it doesn't seem to have this issue. Of course that designer is going away. I would recommend you submit a suggestion in VS's Send Feedback option so the MS team can respond.