Application.php

<?php
declare(strict_types=1);

namespace App\Console;

use Symfony\Bundle\FrameworkBundle\Console\Application as BaseApplication;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Command\ListCommand;

class Application extends BaseApplication
{
    private function isCommandVisible(Command $command): bool
    {
        // we need to leave "list" command as is used for help
        if ($command instanceof ListCommand) {
            return true;
        }

        // we only want commands from app namesapce
        if (str_starts_with($command->getName(), 'app:')) {
            return true;
        }

        return false;
    }

    public function add(Command $command)
    {
        if (!$this->isCommandVisible($command)) {
            return null;
        }
        
        return parent::add($command);
    }
}