Ok, I just “unlocked” the content by writing a test blog post…
The whole page just appeared like in the demo.
But I got another problem with the contact form (Contact Form 7 plugin is installed and activated), I’m getting a 404 error in the shortcode.
I checked the plugin settings and the contact form shortcode in the page, the problem is due to french translation which automatically translates “Contact Form 1” to “Formulaire de Contact 1” and cause the bug.
I changed the shortcode in my page, and it works well.
Thank you for your try to help me