Based on the provided information and the screenshots, we assume that you have custom report parameters UI, which is Kendo MultiSelect widget. However, on the reporthtml.png,
I noticed that there are no available parameter values in the dropdown. This help article explains step-by-step how to use custom parameters UI to update the report parameters instead of using the report viewer's default implementation of the parameters area: How To: Pass Values to Report Parameters.
Please note that as of R1 2019 we provide out-of-the-box editors that allow the user to defined parameters options for the report parameters. In Angular project to set up a Kendo MultiSelect widget for multivalued parameters, you should add the following code snippet in the viewer's initialization file:
// singleSelect: 'COMBO_BOX', for single-value parameters
//for multi-value parameters
If the issue still persists, we would like to review the problematic project. Please open a new support ticket where you could attach the project for further investigation.
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