Questions have been popping up on both the Oracle WebCenter Content forum and the Yahoo! WebCenter Content Users Group about how to hide this Folder field in the new 11g Folders component. In Contribution Folders (folders_g), there was a metadata field (xCollectionID) that could be added to rules and be set to hidden. This is no longer the case in the 11g Folders component. In Folders, you can hide it by creating a rule and setting a rule side effect that does the following:
Add that rule to a profile or make the rule global and the Folder field will now be hidden.
Note: isExcluded can be substituted for isHidden or other field display variables.