How to disable report export type in SSRS?

Find out  the file name "RSReportDesigner.config" at

"Microsoft Visual Studio 9.0\Common7\IDE\PrivateAssemblies\RSReportDesigner.config".

Disable the PDF export option - add the visible attribute with value false.

<extension name="PDF"

  type="Microsoft.ReportingServices.Rendering.ImageRenderer.

        PDFRenderer,Microsoft.ReportingServices.ImageRendering"

   visible="false" />

After this, you need to restart your Report Server. Same way you can disable or enable other formats and then it won’t available in dropdown