Hi!
Do you mean this button on the results page? Unfortunately it is not added nor controlled by our plugin. I assume it is a theme feature, and it may have a separate search process assigned to it. These features usually work together – when the “more results” loader actually fetches the next result page, fetches the results, and adds the results to the current one.
This however works differently, it sends a request to the wordpress ajax handler with the results page parameters and then gets the results via it’s own handler.
The only possible way I can see this work together is by turning off the search override feature. Then our plugin will not affect the results page, and lets that other search handler control it.