How to limit card number in a list?
To change the limit of cards numbering in a list, first open the List Details. In the provided popover window, edit the number of cards in the Limit card number field. The available card number will be shown on a dashboard near the list title.
If you exceed the defined limit of the added cards, the number of cards will become red. If you do not want to limit card quantity, simply remove the checkbox next to the Limit card number option.