We use Kanban Board to monitor issues that are created, resolved and tested. Our teses column has relatively high number of cards which are completed and no more in use. We have created another Tested column, named this one as 'Tested -2" and started moved the bug fixes into this one.
Is there a way, we can archive the columns that we are not using any more? But want to refer them in case if the bug arises in future.