How disable registration in laravel

Laravel Breeze is nothing more than a scaffolding tool. If you want to turn off registration you need to remove some stuff:

• Remove registration routes in routes/auth.php
• Remove controller in app/Http/Controllers/Auth/RegisteredUserController.php
• Remove the view in resources/views/auth/register.blade.php

In your case removing the routes is already enough, but for a good clean up the rest is required as well.