Comment on Stallion Responsive SEO Theme Layout Options by SEO Dave.

WordPress 2 Column Layouts The header search form isn’t a widget it’s built in to the theme, to disable go to

Stallion Layout Options : Search Form OFF

This activates the Header Widget Area so you can add something else there via a widget: there’s limited space and formatting in that location, so obviously a large widget (like tags) won’t work correctly, on some sites I add the Google Translation widget. Since the search form and widget use the same space the search form takes priority so has to be turned off to use the widget area.

There’s replacement search widgets to add to other widget areas.