Marta here, from Trello Support.
Currently, Trello doesn't support per-card permissions—once someone has access to a board, they'll be able to see all cards on it. For now, I'd suggest creating separate boards for different permissions levels.
In the meantime, I’ll pass your feedback on to our team for consideration—let me know if there's any additional info you'd like for me to pass their way.
I hope the workaround helps somehow!
If you had to thrive a new habit during a lockdown, what would it be? Trello
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