I have an .rdl file that I need to open in Visual Studio. When I try to open this file, I got an XML file. However, I am unable to see the designer format.
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Correct, the Report Definition Language is just XML. And, as with any other file, you can just open it (File/Open/File...) in Visual Studio, just like in a text editor. In order to see a designer you need to give Visual Studio a bit of context about what sort of file it is by making it part of a Report Server Project.
For opening RDL file in designer make sure you have " Microsoft Reporting Services Projects" Installed.
Refer this : https://marketplace.visualstudio.com/items?itemName=ProBITools.MicrosoftReportProjectsforVisualStudio