Borders: All borders, such as the text area border, the cell borders on a table, or OLE object borders, show in grey to help the author during editing. Those borders are not printed nor exported to PDF. It is possible to change the color of those borders (or eliminate them completely). To change border displays, choose OpenOffice → Preferences → Appearance and adjust settings under “Text boundaries”, “Object boundaries” and “Table boundaries”.Objects inserted automatically: Objects such as the table of contents and the fields show a grey background. This background is not printed nor exported to PDF; it is there during editing only. You can modify that background in the same Appearance menu. There are separate options for “Field shadings” and “Index and table shadings”.