Sort Kadence Post Grid by Post Meta

sort-by-meta.php

add_filter( 'kadence_blocks_pro_posts_grid_query_args', 'sort_by_date_post_grid_order',10, 2 );

function sort_by_date_post_grid_order( $args, $attributes ) {
  if ( 'POST_TYPE_SLUG_HERE' === $args['post_type'] && isset($attributes['className']) && strpos($attributes['className'], 'BLOCK_CLASS_HERE') !== false ) {
  $args['meta_key'] = 'start_date';
  $args['orderby'] = 'meta_value';
  $args['order'] = 'ASC';
  }
  return $args;
}