laravel 6 debugger

Open the terminal and to do like this as your wise

1) Install DebugBar

The DebugBar 2.4.x is for Laravel 5.4-
The DebugBar 3.0.x is for Laravel 5.5+
A) Install the debuger 2.4 (Documentation)

composer require barryvdh/laravel-debugbar:~2.4
You will also need to add in providers array in config/app.php :

Barryvdh\Debugbar\ServiceProvider::class
B) Install the debuger 3.0 (Documentation)

composer require barryvdh/laravel-debugbar --dev
2) After that, you need to update the composer

composer update
3) Clear cache and config

php artisan cache:clear

php artisan config:cache
4) Then after you need to add a line to .env file

APP_DEBUG=true