Display Posts by Modification Date in GeneratePress

On My Previous Theme, I used that function, but I don’t know how to do it in generate press

So Can you help me to do this with generatepress theme?
Previously I was using WordPress Filter for this

//function to modify default WordPress query
function wpb_custom_query( $query ) {
 
    if( $query->is_main_query() && ! is_admin() && $query->is_home() ) {

        $query->set( 'orderby', 'modified' );
        $query->set( 'order', 'DESC' );
    }
}
 
// Hook custom query function to the pre_get_posts 
add_action( 'pre_get_posts', 'wpb_custom_query' );

I was using this filter, How can I do this in generate press, and from where can i get generatpress child theme.
Thanks