Hi,
That URL should redirect you to this knowledge base page: https://knowledgebase.ajaxsearchpro.com/miscellaneous/tutorials/how-to-add-variables-to-the-redirect-to-url-or-the-show-more-url
Changing the search results page layout via plugins is not possible, it is fully controlled by the theme you are using. Some themes may have custom page builders integrated, or support for some page builder plugins – otherwise the only solution for customization is by custom coding it.