Hi Bill,
Marta here, from Trello Support.
If I understood correctly, you've left some boards you were a member of but are still seeing them in your account, is that right? Can you please try clearing your browser's cache and cookies to see if you're still able to see those after? Alternatively, you can try opening Trello from an incognito window to see if you can still replicate the issue.
I'd also suggest taking a look at this article for more information on Leaving a board in Trello. That will remove you from the board completely, and you won’t be seen in the members section any more, or receive any notifications about the board.
I hope that helps!
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