Fields /text/swriter/01/03090000.xhp
Field Names Switches the field display between field names and field contents. A check mark indicates that the field names are displayed, and no check mark indicates that field contents are displayed. Some field contents cannot be displayed.
To change the default field display to field names instead of the field contents, choose %PRODUCTNAME - PreferencesTools - Options - %PRODUCTNAME Writer - View, and then select the Field codes checkbox in the Display area. When you print a document with View - Field Names enabled, you are prompted to include the field names in the print out. Insert - Fields.