I hope you are well today and thank you for your question.
The search results page is displayed by the search.php file of the theme that you are using on your site so the plugin doesn’t control how it is displayed but your site theme controls it.
You can display the search results as a grid developing custom code in the search.php file of your child theme by contacting the theme author or consider hiring a developer to develop it for you. You can hire a developer from any freelance site or WordPress agency.
You can also consider hiring us to develop it for you using the form https://ivorysearch.com/custom-work/
Best regards,
Ivory Search Support