debug toolbar not showing in xampp

For the debugging panel to work properly, it’s enough to correctly specify the $baseURL in the file app/Config/App.php in accordance with the Apache config.

As example:

httpd-vhosts.conf
<VirtualHost *:80>
    DocumentRoot "C:/xampp/htdocs/ci4example/public"
    ServerName ci4.domain.com
</VirtualHost>

app/Config/App.conf
public $baseURL = 'http://ci4.domain.com/';