Content tab source and WYSIWYG panes are available on the Articles main tab in Ted4 and Fred4 and on the Pages main tabs in Fred4.
The Articles main tab source and WYSIWYG panes
The Articles main tab contains, for each article, two panes that can be displayed or hidden separately: the source pane and the WYSIWYG pane. You can edit text in both panes, but you can review the GNML tags only in the source pane. For more information, see Articles Source Pane and Article WYSIWYG / Web Pane.
The Pages main tab source and WYSIWYG panes
The Pages main tab contains, for each page, two panes that can be displayed or hidden separately: the WYSIWYG pane (that is where the page is displayed) and the text source pane (sidebar) where you can edit text and review GNML tags. For more information, see Source pane - Text Editor and Pages zone.