The widget layout is not determined only by the search plugin, it depends on your theme as well.
However there is something you can try, that might help. Open up the wp-content/plugins/ajax-search-pro/includes/widgets.php file and go to lines 55-56 where you should see this code:
if (!empty($title)) echo $before_title . $title . $after_title;
Remove those lines or comment them like this:
//if (!empty($title)) // echo $before_title . $title . $after_title;
If this doesn't help, then you might need to contact the theme developer as well.Best,
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