I use Buisness-template (not a Next-gen one) and want to hide all finished issues from the board, which are older then 2 weeks, but I don't want to delete them, just hide. How can I do it?
You should be able to update the query which populates the board to do this, you would want to add JQL similar to:
AND (resolution = empty OR resolved >= -2w)
This will show issues with an empty resolution or those whose resolution date is within 2 weeks.