Change language dynamically CI 4.4.6

I'm trying to change the language of my app.

I've tried inside the BaseController in the initController method in several ways

PHP Code:

$lingua = session('lingua');
config('App')->defaultLocale = $lingua; 


or

PHP Code:

$lingua = session('lingua');
(!isset($lingua)) ? $this->request->setLocale('it') : $this->request->setLocale(session('lingua')); 


or

PHP Code:

$lingua = session('lingua');
config('App')->defaultLocale = $lingua;
(!isset($lingua)) ? $this->request->setLocale('it') : $this->request->setLocale(session('lingua')); 


If I try to print these variables on the screen I receive:
echo session('language'); returns "en"
echo config('App')->defaultLocale; returns "en"
echo $this->request->getLocale(); return 'it'
If I manually change the value of public string $defaultLocale to 'en' or 'it' everything works and I see the app in the desired language

What should I do to be able to change the language dynamically?

I don't need the URL changed.