Do you used the Web Report Designer online demo site? If this is the case the demo site is not supporting save operation. Generally the save operation saves the report on the server and this will make the changes visible/available to all of the demo site users. In order to fully test the Web Report Designer my recommendation is to use the provided with the installation demos. The CSharp.ReportExamples.VS2019 solution contains the CSharp.AspNetCoreDemo project, that demonstrates Web Report Designer in webReportDesigner.html.
For more information on the Web Report Designer see the documentation articles on the topic.
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