To archive a task, please right-click on the Kanban card and use the dropdown menu to find the Archive option at the very top.
By default, this option is only available in the last column of your Kanban board. But should you wish to enable archives in any other column as well, please go to Settings - Board Editor and use the pencil icon under a chosen column’s name, to set its properties in a way, that will allow for tasks to be archived there (use the option is at the bottom of the column edition window).
To archive all tasks in a column, either right-click on the header of that column, or click on any empty space in that column, and select the Archive all option.
Using the archive is easy - to enter, click the + # archived tasks link at the top of your last column:
A list of all archived tasks for this particular column will be presented.
But note, that once you’re in this view, you can search through tasks archived on specific boards, swimlanes and columns. Also - you’re welcome to search the archive with the magnifier icon - it supports the same set of search queries, that Global Search of the boards does. Learn more about Global Search.
Want your tasks to get archived automatically? Please read about how to set auto-archive feature.