This tab is only visible if you are authorized to configure the Data Definition for the selected folder.
On this tab a Data Definition can be associated with the folder and its subfolders. If a Data Definition is associated with all Content Wizards in this folder and its subfolders, the Content Wizards will use the Data Definition to locate Field Sets and to provide conditional and repeating elements.
Data Definitions can only be associated with folders within the Content Wizards folder. Folders in subfolders always use the Data Definition associated with their parent folder.