Database Detail view shows detailed information for whatever node you double-click in the Database Structure view. What is displayed will depend on the database type that you are using.
When you select a database node in the Database Structure view, the Database Detail view will show you the connection information as shown in the figure below.
When you select a specific table in the database connection in the Database Structure view, the Database Detail view shows you detail information about the selected table including Exported Keys and Imported Keys.
The Imported Keys column shows how the table references other tables based on primary and foreign key declarations.
The Exported Keys column shows how other tables reference the selected table based on primary and foreign key declarations.