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Hi Mateusz,
The Margins can be changed from the Properties of the report -> Layout -> PageSettings -> Margins:
In case the Margins property is missing, then you need to update the Telerik Reporting references to at least the R2 2021 SP1 release because previously, the margins inputs were missing - The Margins of the Report PageSettings cannot be set in the Web Report Designer (telerik.com).
Thank you for using Telerik Reporting!
Regards, Dimitar Progress Telerik