I want to make sure that one of the list in the board is not deleted by mistake. is it possible to somehow pin it or lock it. so if i wanted to delete i will be prompted to remove the lock first?
It's not possible to lock or pin a particular list right now—any board member has full edit access to all cards on the board.
However, it's only possible to archive a list, not fully delete it, and archived lists are fully recoverable: https://help.trello.com/article/786-archiving-lists-deleting-lists
@Muhammad Ali with Butler you could have a command:
When a list is archived unarchive the list
Butler isn't currently accepting new registrations while the Trello team are working on integrating it, but using Trellinator you could achieve the same thing:
The command would look like this:
If you had to thrive a new habit during a lockdown, what would it be? Trello
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