There is no way to remove those files from the "Recent" list in the Home tab at onedrive.com.
Eventually, they will go away.
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I use One Drive through a web browser (Currently Firefox usually) and have several files it lists as my recent files that I get an error when clicked on. I DO NOT want to recover these files. I want to remove them from my Recent Files list as I ALREADY deleted them ON purpose from my PC way over 30 days ago and emptied the recycle bin ON purpose. I do not have, nor do I want the actual One Drive app on my PC as this PC is used for gaming 99% of the time. If I have a file I wish to put up in the cloud for safekeeping I use a web browser and log into OneDrive that way.
There is no way to remove those files from the "Recent" list in the Home tab at onedrive.com.
Eventually, they will go away.