Just to be sure if I understood the question correctly - to show the value of multivalue parameter in the report, you can use Join() built-in function
, for example:
= Join(", ", Parameters.Parameter1)
This will return all values selected for the Parameter1 separated with comma in a single string, given that the Parameter1 is a multivalue parameter.
If your scenario is different, then you might need to add the user function in which case the Standalone Designer needs to be extended.
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