I send you 2 attached images with my results in the Bryntum example.. The result is not exactly the same that in my project. (In my project the columns and columns titles are changing correctly, but the cards are gone as they are in the Bryntum example.
Could you check the images I attach you, and tell me what could be wrong, or how we could display the cards /avoiding hide them on changing the columns?
I checked on our demo and it worked just fine. I'm sharing a video to show working correctly. Just in case, could you please clear your cache (just to confirm that you're getting the most up-to-date code)?
Also, again, the test case would be nice. Is there any error being displayed on the console?