Zoom magnification and Page Break Preview
The zoom percentage used when viewing a sheet in normal mode can be controlled by
setting the normal_magn attribute of a Sheet instance.
The zoom percentage used when viewing a sheet in page break preview mode can be
controlled by setting the preview_magn attribute of a Sheet instance.
A Sheet can also be made to show a page break preview by setting the page_preview
attribute of the Sheet instance to True.
Here's an example to show all three in action: