Can anyone tell me: Do I have to declare all of my controllers in Routes.php in Codeigniter 4?
I can't seem to get a controller to work unless I add it directly to the "Routes.php"
I have created my controllers properly and the Home controller is working after install and setup.
If I add the controller My_page.php :

<?php

namespace App\Controllers;

class My_page extends BaseController{

    public function index(){

        echo "Controller 'My_page' -> function index() ";

    }

}
?>

I get a : "404 - File Not Found Sorry! Cannot seem to find the page you were looking for."
If I now add the controller to the rout - i.e.:

$routes->post('my_page', 'My_page::index');

Then my controller works properly and I get the "Controller 'My_page' -> function index() " when I visit www.mydomain.com/my_page
I have also tested: www.mydomain.com/index.php/my_page
and this makes no difference.
I am using the .htaccess that comes with the download. I have updated the base URL to www.mydomain.com/
The documentation is confusing to me - https://www.codeigniter.com/user_guide/incoming/routing.html#setting-routing-rules ;
it sounds like they are saying have to declare all classes with routes?

Why are my controllers not working without declaring them specifically in Routes.php?

And am I misunderstanding ' setAutoRoute(true) ' it also does not seem to work - I expect that I can turn this on and simply create my controllers pretty much like in CI3?