jet-engine-grid-custom-order.php

<?php

add_filter( 'jet-engine/listing/grid/posts-query-args', 'je_custom_listing_order', 10, 2 );

/**
 * Add multiple order by paramters to listing grid widget.
 *
 * What you need t replace:
 * - speakers_list - replace this with your custom ID added to Listing widget
 * - is-featured, speaker-name - meta fields names we need to sort by.
 * - featured_clause, name_clause - your custom keys for order clauses
 *
 */
function je_custom_listing_order( $args, $widget ) {

	// We need to add custom CSS ID to listing widget, to ensure we modifying correct query
	$id = $widget->get_settings( '_element_id' );

	if ( 'speakers_list' === $id ) {

		// Then we need to add apropriate meta fields into meta_query argument
		$args['meta_query'] = array(
			'relation' => 'AND' ,
			'featured_clause' => array(
				'key'       => 'is-featured',
				'compare'   => 'EXISTS',
			),
			'name_clause' => array(
				'key'       => 'speaker-name',
				'compare'   => 'EXISTS',
			),
		);

		// And then set order by these fields.
		$args['orderby'] = array(
			'featured_clause' => 'DESC',
			'name_clause'     => 'ASC',
		);
	}

	return $args;

}