You can zoom the entire contents of the editor quickly with the Zoom control in the status bar below the editor window. This control is also available in the tab in the ribbon toolbar.
You can also switch the editor display between the styles defined for electronic help formats (HTML Help, WebHelp, Visual Studio Help and eWriter Help) print-style help formats (PDF, printed manuals, Word DOCX and generic ePub and Kindle ePub eBooks).
This will only have an effect if you have defined different settings for screen and print output in your style definitions. See Multiple style sets for more information on using different style sets for different output formats.
Display buttons in the status bar:

|