WPB Filterable Portfolio custom taxonomy filter

functions.php

<?php 
// Add the code below to your theme functions.php file


add_filter( 'wpb_portfolio_post_args', function( $args, $shortcode_id ){

    /**
     * $shortcode_id: shortcode generator custom shortcode ID
     * For the Elementor use, add the Elementor widget ID
     */

    if( $shortcode_id == '771' ){
        $args['tax_query'][] = array(
            'taxonomy'  => 'category', // taxonomy key
            'field'     => 'id',
            'terms'     => array(89, 88), // term IDs
            'operator'  => 'IN' 
        );
    }

    return $args;
}, 10, 2 );