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There seems to be an issue with the dashboard layout control, when a panel is dragged and dropped and then the window is resized while also the number of columns changes in the SfDashboardLayout.
The dashboard layout works as expected if a DashboardLayoutPanel is not dragged and dropped. Once a
dragged and dropped the layout is no longer functioning as expected. The show grid lines aren't taking the full length of the screen; also each column is smaller since all columns aren't taking up the full screen size as well.
Let me know if you need more information.