Title less content creation with dexterity

Dear All,

I have created a content using dexterity.
I don't want the user to fill the title and summary field.
I reffered https://plone.org/products/archetypes/documentation/how-to/title-less-type

I have used dexterity for content creation and not able to find the
title widget in code explicitly.
Where to find the content title and summary widget, so that I could do
something as in the link .
Thanks in advance.

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