Missing Yoast-section in page editor

I am working with WP5.4.1, Yoast 14.0.3 and the Total Theme 4.9.9.2 which is including WPBakery Page Builder (6.1). (also using PolyLang and other Plugins)
My problem is that the Facebook OpenGraph credentials are not what I want but I do not manage to change them.
The reason is that when editing a Post there is, as it should, a “Yoast SEO” section which allows me to modify the SEO details.
However, I am missing this when editing a page instead of a post. There is just no “Yoast SEO” section. I can edit the page but nothing related to Yoast.
In detail I have the following sections available in the page editor:
Theme Settings, Image Gallery, Revisions, Custom Fields, WPBakery Page Builder, Comments, UM-Inhaltsbeschränkung (an access restriction tool), Revolution Slider Options

For solving this I have already updated to the above mentioned versions and I have created a FB App ID (which I only need for Yoast). No success until now.
This is in the regular backend Editor as well as in the “Classic Mode” editor.

The page I need help with: [log in to see the link]