Thank you for writing.
To do that you should utilize the RadPrintDocument API:
RadPrintDocument doc =
doc.Margins.Left = 200;
More information on the matter is available here: http://docs.telerik.com/devtools/winforms/telerik-presentation-framework/printing-support/radprintdocument/radprintdocument
I hope that you find this information useful. Should you have any other questions, do not hesitate to contact us.
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