Hosted Search App Tab
Site Search > Navigation Pane > Search App > Settings > Apps Management > Hosted Search App Tab.
A “hosted search app” is a search page that lets you share the results of your Site Search project with your audience. It looks much like this one:
The viewers don’t have to log in to Site Search to view and critique your project. Simply share the Hosted Search App URL with the users.
The checkbox turns on this feature. The Edit button lets you lock down the search page with a username and password.