Wordpress pre_get_post valid both for standard and ajax requests

functions.php

<?php 

/**
 * Pre get posts valid both for standard and ajax requests
 * on ajax request we can specify the provider (in this case we're using elementor pro archive) and post type
 */
add_action( 'pre_get_posts',  'my_products_pre_get_posts');    

function my_products_pre_get_posts( $wp_query ){

  if ( wp_doing_ajax() ) {
      // here is specified the epro-archive/default provider as we are using the filters for elementor built archive
        $products_query =  boolval( isset( $_REQUEST['provider'] ) && $_REQUEST['provider'] === 'epro-archive/default' && 'product' == $wp_query->get( 'post_type' ) );
        $ajax = true;
    } else {
        $ajax = false;
        $products_query = boolval( ! is_admin() && ( is_post_type_archive( 'product' ) || is_tax(array('product_cat')) || iic_is_wc_attribute() ) && $wp_query->is_main_query() );
    }

    $tax_query = (array) $wp_query->get( 'tax_query' );
  
    // don't get posts from specific taxonomy term
    $tax_query[] = array(
           'taxonomy' => 'custom_cat',
           'field' => 'slug',
           'terms' => array( 'custom_cat-slug' ), // Don't display products in the proficiency-test category on the shop page.
           'operator' => 'NOT IN'
    );
    
    // don't get Woocommerce hidden products
    $tax_query[] = array(
           'taxonomy' => 'product_visibility',
           'field' => 'slug',
           'terms' => array( 'exclude-from-search', 'exclude-from-catalog' ), // Don't display products that are hidden from search and catalog (woocommerce setup)
           'operator' => 'NOT IN'
    );

    if ( $products_query ){

         // custom order
        $wp_query->set('orderby', 'menu_order');
        $wp_query->set('order', 'ASC');

        $wp_query->set( 'tax_query', $tax_query );

    }

}


?>