The Global preferences panel is opened from menu Global
→ → +For editing different types of XML documents (for content completion, validation, authoring) <oXygen/> can use information from the external document types which are stored in the frameworks directory. If a custom frameworks directory is specified then the <oXygen/> will load the document types from this location.
Show system hidden files and folders in the file and directory browsers. This setting is not available on Mac OS X.