Generally, the Visual Studio designer will use the latest version installed on the machine (in case of multiple installed versions). You might check the version from C:\Windows\Microsoft.NET\assembly\GAC_MSIL\Telerik.Reporting.Design.VisualStudio
folder. Check this screen shot for reference - https://www.screencast.com/t/zbiWsVaOasFr
For the Standalone Designer version, go to File -> Help
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and vote to affect the priority of the items