Greetings from Syncfusion.
Query 1: In the Kanban component with card template, if I clear the columns and add again, i have a desgin break.
We have analyzed the reported issue and tried to replicate the sample by preparing a simple sample and we are afraid we were not able to reproduce the issue at our end. We have attached the sample we prepared below.
Since we are not aware of your application scenario we were not able to reproduce this at our end. So, can you please revert us by modifying the sample based on your application along with replication procedure. This would be helpful for us to provide you a better solution at the earliest.
Query 2: If i'm using header template and clear the columns, sometimes occurs 'index out of range' and not show the title.