We do offer search operators in Trello that you could use to narrow down search results. For example:
board:"Support Planning" is:open -list:"C" list:"B" list:"A" label:"X"
You can read more about the available search operators here: Searching for Cards (All Boards) Would this help in your case?
If you had to thrive a new habit during a lockdown, what would it be? Trello
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