If you use a NavigatetoReportAction, target reports are opened as separate reports, but in the same viewer.
If you use a ToggleVisibilityAction, the hidden item/section will be displayed where it was designed to be.
If you use a NavigateToUrlAction, you can open a new page with other viewer or else. You can pass information through the query string that can be build via expression on specifying the URL.
For more information, please check Actions
I hope this helps.
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