The blue lines actually visualize the PagesPreview
canvas. This canvas is mostly used to determine the size of a page for a print operation within the diagramming surface.
You can find more information about the properties that help customize the size and visualization of the PagesPreview
canvas in our documentation
In your case, the property you need to modify is BackgroundPageGrid.PageSize
- this property is of type Size
and it determines the size that describes a single page in the RadDiagram
surface. The default value of the property is a size of 1092x763 units - the size of an A4 page format.
Please let us know if we can further assist you.
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