Hi Elizabeth, many thanks for your question.
With the Brickfield Starter checks, the only way to stop it showing up in the report is to remove the “open in new window” option. We will update our starter language string appropriately in the next update.
To provide some background, there are very few valid reasons for forcing a user into a new window and there are many reasons why you should not do so.
I love one quote from the Nielsen Norman Group, or NN Group, an industry recognised World Leader in Research-Based User Experience, "Opening up new browser windows is like a vacuum cleaner sales person who starts a visit by emptying an ashtray on the customer's carpet. "
Here are some reasons why you should not force links to open in new windows
For everyone, bouncing people into another window is a surprise and not a good one (like a box of chocolates). This will further create problems for users with low sight or cognitive disabilities who may not see that a new tab has opened.
Opening a new window or tab resets the back button in that window. Users with screen readers cannot go back to the page they came from. This breaks the navigation experience for that user.
Whenever someone clicks a link they should be able to go back. The back button is a heavily used feature in browsers.
If the person is using a terminal - they force one window only generally, so putting a link into a new window literally means they cannot navigate between windows/tabs and will either lose the existing site or not access the new link.
Navigating multiple windows/tabs is a pretty horrible experience and can cause a lot of confusion on mobile devices - especially phones - this is not an experience you want to force on your users
The core, starter version flags these issues for your action. With our Premium product, we have helpers that offer different ways to handle opening links in new windows.
In short - let the user decide if they want to open a link in a new window or not - and perhaps add “(external site)” as text so they can tell if it’s external.