Search results using wp shows posts, showing posts first

Hello,

I am working on a website, I am using wp show posts on search results page.

I am using this code shared by tom in one of the forum.

add_action( 'generate_before_main_content', function() {
    if ( is_search() ) {
        wpsp_display( 15135 );
    }
} );

add_filter( 'wpsp_query_args', function( $query, $settings ) {
    if ( 15135 === (int) $settings['list_id'] ) {
        $query->set( 's', esc_html( $_GET['s'] ) );
    }

    return $query;
} );

add_filter( 'generate_has_default_loop', function( $has_loop ) {
    if ( is_search() ) {
        return false;
    }

    return $has_loop;
} );

(Using wp show posts with ID 15135)

It works, but for the item which I made in the wp show posts, I selected no category or tag, so that is why it shows all the posts first and then the search results item.

For example on this page,

https://staging16.brookingindustries.com/?s=tempest

I searched a query Tempest (which is a page basically) it works, it shows in the end, but above you will see it fetches all the posts I have on the website.

Any help would be appreciated.

Thank you in advance!