Hi,
1. You need to change the ajax search lite shortcode to ajax search pro shortcode in that section: [wd_asp id=2]
It is still the shortcode from the lite version. Once you change it, it will be all right.
2. You can change the sources here. You probably want to disable the google suggestions, and use tour-cat or similar.
3. The results page layout and fields are not affected by the plugin unfortunately. It only sends the results there, but the theme/theme builder is handling the layout. You may need to look for options within the theme you are using for that.