From the provided screenshot I could assume that you are using the obsolete ASP.NET WebForms Viewer. It seems that the report parameters area is partly hidden by the report. We tested with a sample project, but couldn't reproduce the problem in the Edge browser.
For your convenience the testing sample project is attached. The "WebApplication2" project uses the obsolete ASP.NET WebForms Viewer, and on our side does not experience the issue on neither of the major browsers. The "WebApplication1" project uses the HTML5 Viewer and is included just for comparison. I would recommend you to switch to the HTML5 Report Viewer.
If you would like us to investigate the issue further, I would ask you to open a ticket and attach a sample runnable project that demonstrates the problem.
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