Details and association facets contain a row with tabs which allows navigation between them.

This tab row creates yet another line in page header which takes place otherwise useful for page's content.

UXD recommendation is to change the pages to use two column layout where the tabs would be transformed into the navigation column as designed at:

https://www.patternfly.org/layouts/layout-templates/ [[BR]]
https://www.patternfly.org/wp-content/uploads/patternfly/tests/form.html