I can't see modules for customize

Hello.
I'm trying to modify my page using generatepress. When I push appearanze/customize I can't see modules, I only see "You are customizing" (And the name of my page) down of that, There are nothing.
https://docs.generatepress.com/article/backgrounds-overview/
I this link, you can see the backgrounds module -
Body
Top Bar
Header
....
I can't see in my Wordpress panel.

I've activate all modules in Appaeranze/GeneratePress.

What is the problem?

Sorry for mistakes, I don't write very well english and I'm rookie.