Twig: Form

[hornofj]

The form for creating new customer is now rendered by default like this:

{{ form(form) }}

That will automatically render all the form fields in a default layout. When you need another layout to style the form with bootstrap, you need to either create a form template in Symfony, or use the individual twig tags to render the fields separately.
Choose the approach you want to refactor the form into nice layout using bootstrap.