SSRS report - all hyperlinks have target of _top

Where are you putting this expression exactly? Normally to add a hyperlink you put a Textbox on the report and set the URL using the Action section. That doesn't allow you to change the link behavior. The link behavior is determined by the client. For example while in the designer it'll open a new tab but in Report Manager it'll open in the same window if I remember correctly.

The only way I've seen to get it to open in a different tab is to use Javascript. Here's one possible approach.

="javascript:void(window.open('url', '_blank'))"

But you should test this to make sure it works and it might only work in a web app.

Hi @mark goldin ,

="<a href=""https://www.google.com"" target=""_blank"">Link</a>"

Now when your visitors click that link, it will open in a new window or tab (depending on which web browser they are using and how they configured that browser).
Note that if your web page uses the "strict" DOCTYPE of XHTML 1.0 or 1.1, you will not be able to do the above and still have your page validate as correct.
For more information,please refer to: How to Make Links Open in a New Window or Tab.
Redirect to report viewer page in a new window.
Best Regards,
Joy

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I haven't been working with SSRS for quite some time. At the time I did, I was using the latest, I guess 16 or later. Try PowerBI paginated report builder. What if that one has less bugs??