Thanks for the reply, but it doesn't answer my question. 

I want the contact to be assigned to the user's default company, I have to configure odoo in multi-company. 

a user has a default company, when he creates a contact, the contact must be assigned to his default company. this allows other companies not to see it.

Hi,

Please go through our blog Overview of Odoo 16 Contact Module
https://www.cybrosys.com/blog/overview-of-odoo-16-contact-module

Hope it helps