Firstly, my assumption is that you have a WinForms application which is using the Windows Forms Report Viewer.
I experimented with our demo reports and indeed, when using DPI Unaware application to preview the report, it is rendered with smaller size and remained space on the right and this is an expected behavior.
When using Windows Forms ReportViewer on a machine with DPI scale factor higher than 96 (100%), Windows will stretch the application bitmap to the expected physical size, although this results in the application being blurry. This is because the application in which you are using the Windows Forms Report Viewer is not declared as DPI aware.
However, the recommended approach is setting dpiAware
element in your application to avoid further scaling, visual or interaction issues. You might check our demos located in product installation path, i.e. C:\Program Files (x86)\Progress\Telerik Reporting <VERSION>\Examples\CSharp|VB\WinFormsDemo. Note the dpiAware.manifest
file at the root of the application.
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