Is posible to add feature or maybe such a plugin exists or maybe can make some changes in CSS to set max height for swimlane? Ideally with the vertical scrollbar for each column which height is more than maximum (or link show more for expand). I would like to show at leat 2-3 cards for each swim lane at first view. Espacially for public view. Now if there are many cards in backlog the second and next swimlane has to be scroll down. Thanks for your suggestions 
Hello, welcome to the forum.
Can you post a screenshot please to give everyone a visual idea of what you mean?