I have a index page and group content

I’m trying to create a main page for login, but the content group I added to the index page is now shown in the page when I click in preview. Why the content group is not shown in the index page?

This a print screen of the app configuration how it is saw in the builder

Then in preview is a blank page:

Why? I already changed the visibility , etc.

I already found what was the problem , there is a field in the group element called “This element is visible on page load” I need to thick it to see the elements.