Customized case hovers are the recommended feature to improve the user experience, because they allow service agents to see the most recent feed activity on the related case without having to manually open the record. Customized case hovers are pop-up windows that display information about a case when an agent hovers over a case number or name in the Service Console. The information can be customized to include fields, related lists, or feed items from the case record. Verified References: : Customize Case Hovers