Dokan - Adding checkbox for custom settings on New product popup/without popup form

Readme.txt

This code adds the Checkbox field to Dokan and to WooCommerce. 

But
  If the administrator on the Wordpress side edits, the box is saved.
  If the seller edits via Dokan, the box will remain unchecked after he saves the page.
  

function.php

<?php

/**
 * 1. Add checkbox
 */

//This field Adds a checkbox to the edit product page by Wordpress and Display him
add_action( 'woocommerce_product_options_general_product_data', 'add_related_products_checkbox' ); 
function add_related_products_checkbox() {
    woocommerce_wp_checkbox( array(
        'id' => 'hide_related',
        'class' => '',
        'label' => 'Remove related products'
        ) );
}

// This field Adds a checkbox to the edit product page by Dokan
add_action( 'dokan_new_product_after_product_tags','dokan_add_related_products_checkbox', 10 ); 

function dokan_add_related_products_checkbox(){ ?>

    <div class="dokan-form-group">
        <label for="hide_related" class="form-label"> 
            <input name="hide_related" id="hide_related" value="yes" type="checkbox"> Remove related products <i class="fa fa-question-circle tips" aria-hidden="true" data-bs-original-title="Check this box if you want to remove the related products on product page."></i></label>
        </div>
   <?php
}

/*-----------------------*/

/**
 * 2. Save checkbox
 */

//Save checkbox field by Wordpress
add_action( 'save_post_product', 'save_related_products_checkbox' );
function save_related_products_checkbox( $product_id ) {
    global $pagenow, $typenow;
        
        if ( 'post.php' !== $pagenow || 'product' !== $typenow ) return;
        if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) return;
        if ( isset( $_POST['hide_related'] ) ) {
            update_post_meta( $product_id, 'hide_related', $_POST['hide_related'] ); } 
        else delete_post_meta( $product_id, 'hide_related' );
}

// Save checkbox field by Dokan
add_action( 'dokan_new_product_added','save_add_product_meta', 10, 2 );
add_action( 'dokan_product_updated', 'save_add_product_meta', 10, 2 );

function save_add_product_meta($product_id, $postdata){

    if ( ! dokan_is_user_seller( get_current_user_id() ) ) {
            return;
        }

        if ( ! empty( $postdata['hide_related'] ) ) {
            update_post_meta( $product_id, 'hide_related', $postdata['hide_related'] );
        }
}


/*-----------------------*/


/**
 * 3. Display checkbox
 */

//Showing field data on Dokan product edit page

add_action('dokan_product_edit_after_product_tags','show_on_edit_page',99,2);

function show_on_edit_page($post, $post_id){ 
    $hide_related = get_post_meta( $post_id, 'hide_related', true );
?>

<div class="dokan_product_my dokan-edit-row ">
    <div class="dokan-section-heading" data-togglehandler="dokan_product_my">
        <h2><i class="fa fa-cubes" aria-hidden="true"></i> Моя таба</h2>
        <p>Управление моей табой.</p>
        <a href="#" class="dokan-section-toggle">
            <i class="fa fa-sort-desc fa-flip-vertical" aria-hidden="true" style="margin-top: 9px;"></i>
        </a>
        <div class="dokan-clearfix"></div>
    </div>

    <div class="dokan-section-content">

        
   <div class="dokan-form-group">
       
       <label for="hide_related" class="form-label"> 
       <input name="hide_related" id="hide_related" value="yes" type="checkbox"> Remove related products <i class="fa fa-question-circle tips" aria-hidden="true" data-bs-original-title="Check this box if you want to remove the related products on product page."></i></label>
       
     </div> </div> </div><?php

    }


/*-----------------------*/

// 4. Hide related products in single product page

add_action( 'woocommerce_after_single_product_summary', 'hide_related_products_checkbox', 1 );
function hide_related_products_checkbox() {
    global $product;
        
        if ( ! empty ( get_post_meta( $product->get_id(), 'hide_related', true ) ) ) {
            remove_action( 'woocommerce_after_single_product_summary', 'woocommerce_output_related_products', 20 ); }
}

future.php

<?php
/**
* Change the number of related products
*/

function woo_related_products_limit() {
global $product;
$args['posts_per_page'] = 6;
return $args;
}
add_filter( 'woocommerce_output_related_products_args', 'related_products_args', 20 );
function related_products_args( $args ) {
$args['posts_per_page'] = 3; // 3 related products
$args['columns'] = 1; // arranged in 1 columns
return $args;
}
?>

<?php
/**
* Try the following that will remove related products from specific defined product ID(s) page(s):
*/
add_action( 'woocommerce_after_single_product_summary', 'remove_related_products_conditionally', 1 );
function remove_related_products_conditionally(){
    global $product;

    // HERE Define your targeted product Id(s) (in the array)
    $targeted_products = array( 37 );

    if( in_array( $product->get_id(), $targeted_products ) )
        remove_action( 'woocommerce_after_single_product_summary', 'woocommerce_output_related_products', 20 );
}
?>