Talking about Drupal 7 and the Modules Inline Entity Form and Commerce.
My stupid question is a little problem. I can not configure the module and my searches do not give me anything.
After my product display creation, got an additional form "Details" including the form fields:
Product title *, Price * Status *, and the "Description" and "Regulations" text filds.
I do not need the form, but need the "Add to Cart" only.
The setting of Product display: the "Product" field - link to product, widget Inline entity form - Single value.