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1.10.11 Displaying and Printing Mathematica Notebooks
Depending on the purpose for which you are using a Mathematica notebook, you may want to change its overall appearance. The front end allows you to specify independently the styles to be used for display on the screen and for printing. Typically you can do this by choosing appropriate items in the Format menu.
Front end settings that define the global appearance of a notebook.
Here is a typical notebook as it appears in working form on the screen.
Here is the same notebook with condensed styles.
Here is a preview of how the notebook would appear when printed out.