After reading this https://developer.shopware.com/docs/guides/plugins/apps/app-scripts#developing-debugging-scripts, I updated the .env file and set "dev" as APP_ENV value but the debug bar is not displayed anywhere in the storefront.
Is there something else to do?
My local Shopware version is 6.4.18.0
If you used the Symfony Flex template via composer create-project shopware/production you have to additionally install shopware/dev-tools
composer require shopware/dev-tools