Hello! alain feron
Thank you for posting in the Microsoft Community.
I understand that you seem to be experiencing some issues.
In order to help you better, could you please share more information:
Could you please tell us what you are referring to when you mention that the Documents folder shows read-only attributes, is that the content of the image below?

Could you please share with us a screenshot of the document folder you are referring to.
Looking forward to your reply so that we can help you better.
Best regards
InaX-MSFT | Microsoft Community Support Specialist