After installing a Laravel project you will do this command to get the Laravel auth ui,

composer require laravel/ui

Once the laravel/ui package has been installed, you may install the frontend scaffolding using the ui Artisan command,

// Generate basic scaffolding...
php artisan ui bootstrap
php artisan ui vue
php artisan ui react
 
// Generate login / registration scaffolding...
php artisan ui bootstrap --auth
php artisan ui vue --auth
php artisan ui react --auth