Hide a parent page from the front-end but not the children

Hi, I need to hide a parent page from the front-end (not accessible, no URL), but let the child pages visibles. The purpose is to let publishers to hierarchise content by creating a parent page as a category and creating sub-pages within it.
I have seen that there si a new option for page blueprint:
'access' 'true/false' page is not accessible and not listed (since v4.0.0)
I’m not sure, but it seems to be what I search. However, I can’t find any way of selecting this option from the Panel. Maybe I missed something in the reference guide.
Can you enlight me about this option?

If you disable the access option, the page will no longer be accessible in the Panel. This will also affect child pages. Also this option is not useful to prevent frontend access.

Keep in mind that the URL of child pages always contains the path of their parent. So if you have a child page /some-category/some-content, the URL /some-category will still exist. But that’s not a problem. What matters is what happens when a visitor tries to access that category page directly.

A common solution is to do a redirect in the template of the parent page. Let’s say your parent page has the category template. You can create a redirect by placing the following code in /site/templates/category.php:

<?php

go($page->children()->first());

If you then try to access the category page, you will get redirected to its first child page. Alternatively you can also hardcode a different target such as go('/') to redirect to the homepage etc.

That is crystal clear now, thanks.
Your solution seems like a hack but that could be the best way to achieve what I want. Maybe it’s not completely SEO friendly, I’ll ask to my SEO agency.

Oh, I wasn’t expecting anyone to answer so quickly, surprise!