How do I have a hyperlink in Unstack open within a new tab when the visitor clicks the link?
You'll want to select the hyperlink in Unstack to open the tooltip for it which should look like this in the page editor:
If you're working in the Article editor, you'll highlight the hyperlinked text and click the chain icon to open the hyperlink modal:
In both of these cases you'll notice there's a [+] plus icon:
When this icon is BLUE it is toggled on and the hyperlink will open in a new tab. However, if this icon is WHITE it is toggled off and the hyperlink will open in the same tab.