first remove: $fields->removeFieldFromTab(„Root.Main“,“Title“); $fields->removeFieldFromTab(„Root.Main“,“URLSegment“); $fields->removeFieldFromTab(„Root.Main“,“MenuTitle“); $fields->removeFieldFromTab(„Root.Main“,“Metadata“); then add to tab: $fields->addFieldToTab(„Root.NewTab“, new TextField(‚Title‘,’Title‘)); $fields->addFieldToTab(„Root.NewTab“, …