I hope you are well today and thank you for your question.
The plugin uses WordPress search functionality and the WordPress search does not provide an option to achieve what you want to as it is a custom functionality.
You can try achieving it by configuring the plugin search form order to ‘relevance’ as described on the below page.
Order Search Results Posts
Please note that it orders by search terms in the following order:
First, whether the entire sentence is matched.
Second, if all the search terms are within the titles.
Third, if any of the search terms appear in the titles.
And, fourth, if the full sentence appears in the contents.
Best regards,
Ivory Search Support