I'm not the biggest Trello expert, but what I've done is sync all my boards to a personal calendar. (iCal)
You could also try using the new Butler tool to create a rule for every board that any card assigned a due date would be duplicated into an additional master calendar board. Sort of a weird workaround.
I hope someone else in the community has an easier way to pull this off. :)
If you had to thrive a new habit during a lockdown, what would it be? Trello
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