i create a app with odoo 13 studio but i do not know where are principal module and the view for developer over this files,
I think it would be created in the following link
Odoo 13.0e\server\odoo\addons
but i cant find this files, someone to help me
Odoo studio creates the views/menus/field definitions in the database, rather than a "proper" Odoo module.
You can export your studio customisations as a zip file containing xml data, and re-import into another Odoo instance with studio installed.