How to change the appearance of the form that appeared on the pages that are closed?

Question

1C-Bitrix

on this site I opened sections only for registered ones, but I can’t understand where this registration form is called from, and how to add a phone number to it, as I understand it is system.auth.registration, but where to change the template?
https://fimclinic.ru/cabinet/

Answer 1

Register users by phone number: check the box and the phone number will appear
bitrix/admin/settings.php?lang=ru&mid=main&mid_menu=1

Answer 2

The template is taken to /bitrix/components/bitrix/system.auth.registration/templates and copied depending on where you have the site template in
/bitrix/templates/your template/components/bitrix/system.auth.registration/
or in
/ local/templates/your template/components/bitrix/system.auth.registration/