WP: Build options page with free ACF

When I building my portfolio I wanted to have a dedicated page to add all site settings. Using ACF pro we can create this option page but with ACF free version we can build it.

Check this blog for more detailes: https://akzhy.com/blog/create-options-page-in-wordpress-using-free-acf

Add following code in functions.php with necessary page and ACF settings.

//Hiding Gutenberg
add_filter('use_block_editor_for_post', 'disable_gutenberg_on_settings_page', 5, 2);

function disable_gutenberg_on_settings_page($can, $post){
    if($post){
        // Replace "site-settings" with the slug of your site settings page.
        if($post->post_name === "site-settings"){
            return false;
        }
    }
    return $can;
}

//Hide settings page in pages section
function hide_settings_page($query) {
    if ( !is_admin() && !is_main_query() ) {
        return;
    }    
    global $typenow;
    if ($typenow === "page") {
        // Replace "site-settings" with the slug of your site settings page.
        $settings_page = get_page_by_path("site-settings",NULL,"page")->ID;
        $query->set( 'post__not_in', array($settings_page) );    
    }
    return;

}

add_action('pre_get_posts', 'hide_settings_page');

//Adding the settings page to the admin menu
//// Add the page to admin menu
function add_site_settings_to_menu(){
    add_menu_page( 'Site Settings', 'Site Setttings', 'manage_options', 'post.php?post='.get_page_by_path("site-settings",NULL,"page")->ID.'&action=edit', '', 'dashicons-admin-tools', 20);
}
add_action( 'admin_menu', 'add_site_settings_to_menu' );

// Change the active menu item

add_filter('parent_file', 'higlight_custom_settings_page');

function higlight_custom_settings_page($file) {
    global $parent_file;
    global $pagenow;
    global $typenow, $self;

    $settings_page = get_page_by_path("site-settings",NULL,"page")->ID;

    $post = (int)$_GET["post"];
    if ($pagenow === "post.php" && $post === $settings_page) {
        $file = "post.php?post=$settings_page&action=edit";
    }
    return $file;
}

//To add a custom title to the settings page
function edit_site_settings_title() {
    global $post, $title, $action, $current_screen;
    if( isset( $current_screen->post_type ) && $current_screen->post_type === 'page' && $action == 'edit' && $post->post_name === "site-settings") {
        $title = $post->post_title.' - '.get_bloginfo('name');           
    }
    return $title;  
}

add_action( 'admin_title', 'edit_site_settings_title' );