[TYPO3] Configuration of the Admin Panel PREVIEW

[Tesori Musicali Toscani]

Why do I not  see the preview?
This is my configuration

admPanel {
   enable.edit = 1
   module.edit.forceNoPopup = 1
   module.edit.forceDisplayFieldIcons = 1
   module.edit.forceDisplayIcons = 1
   hide = 1
   enable.preview = 1
   override.preview.showHiddenPages = 1
   override.preview.showHiddenRecords = 1
}