Some features in Document Customizer, will only be visible if they are activated. In this way customers that don't use a specific feature is not having their pages cluttered with extra fields, that are not relevant for them.
You can always enable the feature.
In Document Customizer, go to Related -> Feature Management
This will open the page Abakion Feature Management and show you features for Document Customizer.
You can enable the feature and see when it was activated.
It is also possible to open this page from Abakion App Management and see Feature Management for all apps installed in the Company.