Use the Custom Zoom dialog to set a specific zoom level for the WYSIWYG Editor. You may want to make the zoom level less than 100% to see all of a very long topic, or zoom in to a level higher than 100% to view details in an image.
Scale: Specifies a size for the WYSIWYG Editor. Type in a specific number or select one from the drop-down list. For example, enter 78 to set the editor at 78% of its normal size.