The filter feature does not currently support a negative modifier to search for cards NOT containing a certain label. I'll let our team know thats something you'd be interested in.
For now, the search feature does support that modifier. You can read a bit more about that here: https://help.trello.com/article/808-searching-for-cards-all-boards
If you had to thrive a new habit during a lockdown, what would it be? Trello
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