i have a project that is based on a normal drupal, and i have added commerce modules to it, but i can't find the module or setting that changes the way of editing the product from:
can anyone point me to the right direction?
I believe that functionality is provided by the Inline Entity Form module
Provides a widget for inline management (creation, modification, removal) of referenced entities.
The primary use case is the parent -> children one (product display -> products, order -> line items, etc.), where the child entities are never managed outside the parent form.
Edit: In fact it definitely is, this is an image from the module page: