I'd like to set up 4-digit pin code to access to board as a additional security measure, but I haven't found this option in settings or power-ups.
Any thoughts?
Trello does not offer any specific passcode that you can set on a per board basis. You (or the relevant board admins) are however in full control of access to a board.
For example, if a board is set to private only the members that are added by the board admin can view and edit that board. More on board visibility options in Trello is available here: https://help.trello.com/article/789-changing-the-visibility-of-a-board-to-public-private-or-team
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