Change Blog Grid from 3 to 2 for Search Page

functions.php

add_action( 'wp', 'astra_search_grid_check', 15 );

function astra_search_grid_check() {
	if( is_search() ) {
		add_filter( 'astra_get_option_blog-grid', 'astra_change_grid_search_page', 15, 3 );
	}
}

function astra_change_grid_search_page( $value, $option, $default ) {
	$value = '2';
	return $value;
}