Greetings from Syncfusion Support..!
We have validated your reported query and able to reproduce the reported issue at our end. So we suggest you to customize Width property for this issue and for the same we have prepared a sample which can be downloaded from the following link.
Index.razor:
<SfKanban TValue="TasksModel" KeyField="Status" DataSource="Tasks" Width="1200px">
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Kindly try the above solution and if the issue still persists at your end kindly share the below details to serve your better?
- Replicate the issue in the above sample
- Share issue replicating sample if possible
- Share kanban related code snippets
- Share issue depicting video