set_value In Codeigniter4

how it works set_value In Codeigniter4 ? I call helper form but no works... 

You will need to provide some code, so we can see why it's not working.
I can only refer to the manual at this time:
https://codeigniter4.github.io/userguide...#set_value

I think when I return to form the values ​​entered should be kept ... but it doesn't

----- Controller ----

PHP Code:

<?php namespace App\Controllers;

class Account extends BaseController
{
    
     function __construct(){
        
        $session = \Config\Services::session($config);
        $session->start();              
        helper(['url', 'form']);          
     }

  
    public function index()
    {
      echo view('account/login-form');
    }   

    public function login(){
        
    helper(['url', 'form']);        
      
    $rules = [
              'email' => ['label' => 'e-mail', 'rules' => 'required|valid_email'],
              'password' => ['label' => 'senha', 'rules' => 'required'],
             ];
                   
      if(!$this->validate($rules)){
          
       echo    $listErros  =  \Config\Services::validation()->listErrors();
       return redirect()->to('/account/index');
       }
    }    
} 


------ View -----

PHP Code:

<form action="<?php echo base_url(); ?>/account/login" method="post" >
 
 <label for="email">e-mail:</label> 
 <input type="text" name="email" value="<?php echo set_value('email'); ?>" >
 
 <label for="password">senha:</label> 
 <input type="password" name="password" value="<?php echo set_value('password'); ?>" >
 
 
 <button>send! </button>
</form> 


Haven't tested your code, but I think it's your redirect that's the problem. Your values aren't stored in $_POST after a redirect have been made. You need to run both the view and functionality in the same method.