Hi HreggvidurSigurdsson,
Welcome to the Microsoft community and thank you for asking your question in the community!
Based on your description, I understand that you have used the same Microsoft account to log in to both computers, and the same action occurs on the other computer after you add and delete on one computer. I think this is due to the fact that you have turned on OneDrive auto-sync. Since OneDrive can't unsync the Documents, Desktop, Pictures, and Personal Vault folders, you can unsync them. The "Documents", "Desktop", "Pictures" and "Personal Repository" folders cannot be unsynchronized by OneDrive, so you have the option of deleting OneDrive from one computer or dumping it from one computer to another folder that is not on the desktop.
Here are the steps to delete OneDrive:
- Open Settings to find a list of installed apps.
- Scroll down to find Microsoft OneDrive and select Uninstall.
If you still want to know more information, you can also refer to the following links:
- How to cancel or stop sync in OneDrive - Microsoft Support
- Choose which OneDrive folders to sync to your computer - Microsoft Support
Please let me know if I have misunderstood. Tell us the results and we will get back to you as soon as possible. We look forward to hearing from you.
Best regards,
Zhang Yang - MSFT | Microsoft Community Support Specialist