Hi Mehran,
By default the Kanban component doesn’t support this functionality, but I have created a quick ‘workaround’ on how to achieve the functionality you need.
In your JS file:

window.onload = function () {
    const kanbanColumns = document.querySelectorAll('.smart-kanban-column');
    kanbanColumns[0].style.visibility = 'hidden';

Let me know if that works for you!
Please, do not hesitate to contact us if you have any additional questions.
Best Regards,
Yavor Dashev
SmartUI Team