Hi Andrew - I believe you have a good grasp of the situation. The other URL parameter used exactly for this purpose which you may not be aware of is the ?:linktarget=self parameter. Its purpose is to have URL actions open in the same tab. Unfortunately, you have to navigate to the source dashboard with this parameter, for subsequent actions to open in the same tab. This means there is no way that I'm aware of without modifying the URL or embedding the viz in another page.