Custom user registration form

Plone Support
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1

Hello,
I would like to customise the user registration form in the site policy package (not TTW) and am unsure of the appropriate way to do it. In particular, I would like to add additional fields to the form and make the Full Name field mandatory. Could you point me to the relevant documentation or examples of how to achieve this?

I am using Plone 6.0 with classic UI.

I feel like I'm missing something obvious. The most relevant example I found demonstrates how to define the user schema, but the changes only appear in the user profile and not on the registration page.

2

On the example you linked you can see the directive users:forms with value In User Profile.

In that directive, you can specify the field to appear on registration form.

Example for a field to appear in both forms:
users:forms="On Registration|In User Profile"

3

Many thanks, @csanahuja. Your hint solves part of the problem, but I also need to make the Fullname field mandatory.
As far as I understand, the userschema is part of plone.app.users, and its description clearly states that the Fullname and the Email fields cannot be removed nor changed. However, I actually need to adjust both these fields: make Fullname mandatory and add a custom email validator. I assume this needs to be done without relying to plone.app.users, but how should I approach it?