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Hello Pixelator,
Welcome to the Microsoft community.
I was wondering are you trying to hide *.modd files in the OneDrive web side?
If I understand correctly, according to your thought, we have also tested, but currently you can only hide your files in the OneDrive app, and the OneDrive web side may not be able to do this for you.
But it's a good suggestion, we created a feedback based on your idea, hope you can vote. The higher the number of votes, the easier it is to draw attention to this matter from the Microsoft team(note: click This link requires login to vote). You can let your family and friends also vote on this, it may be solved later.
Hide *.modd files. · Community (microsoft.com)
This article is for your reference. If you encounter any problems or have any suggestions in the future, you can also use the Feedback Hub app to send us your suggestions or questions. We attach great importance to your feedback to help us improve your Windows experience.
Send feedback to Microsoft with the Feedback Hub app
Also, if you don't want others to see your *.modd files, then you can move files that are already in your OneDrive to your Personal Vault. Personal Vault is a protected area in OneDrive where you can store your most important or sensitive files and photos without sacrificing the convenience of anywhere access.
- In your OneDrive, select the Personal Vault folder.
- If you're prompted, sign in with your selected identity verification method. For example, select Text and follow the instructions to send yourself a text message on your phone.
- Select Move from.
- Select the files you want to move into Personal Vault, and then select Move items (or drag the items to your open Personal Vault).
You can refer to this article for more detail information.
Protect your OneDrive files in Personal Vault (microsoft.com)
Thank you for your understanding, and for your tremendous contribution to improving Microsoft's products.
Sincerely,
Mavis - | Microsoft MSFT Community Support Specialist