Thanks for sharing that. Are you still seeing the person’s name under the “People” section even after removing all files they shared?
If so, the name stays there until every shared item or link from that person is removed. To fix this, open OneDrive on the web, go to “Shared,” then “Shared with you,” and delete or remove any files still linked to that person. Once everything shared from them is gone, their name will automatically disappear.