How to have the debug bar on all the website ?
In the administration side I activate the debug mode, but the Symfony debug-bar is visible only in the "modules" part.
Is it possible to display it on all the website like the transport section?
It isn't possible. Debug bar is available only on that pages which are built on symfony(Product and Modules pages so far, and Modules Catalog, Performance, System Information if you use Prestashop 1.7.3.0 version).