There was a plugin that offered this functionality (foreman_column_view) but when the host details page was redesigned, they sunset the plugin as the functionality was supposedly being integrated into Foreman itself:
Support #36377
The issue is that the integration didn’t offer the same functionality as the plugin and was limited to a small preconfigured set of configurable columns and limiting the ability to truly customize the details page.
I found the ability to customize the page quite useful. We populated it with information that was important to us and allowed us to easily identify hosts that needed attention without having to go into each host page or generate a report or fact list.
Hopefully they are able to re-enable the customization the plugin offered in a future release. Until then, it may just require us modifying files manually to get it back to what we had previously.
A few other references:
Sunsetting foreman_column_view
New host detail page feedback (Foreman 3.0+) (see end of discussion)