in the webassist/forms/fd_enewssidebar_enewssidebar.css file, change the width of the "form.enewsSideBar_enewsSideBar input.formTextfield_Large" selector to
155px.
to set the width of the form elements in the form builder wizard, click the customize CSS button, from the initial drop down, select Form Elements, then select Text. you are using the Large text fields, so in the size section, select Large, then set the width for the large text fields.