Hi Jordi,

For more specific changes you need to modify the style file

click on the "Format" menu -> "Edit Stylesheet"

A new window pops up. On the top left click ""Choose a Style" combo box

Select for example "Input"

A new cell appears. Click on its cell bracket on the right and then "Format" -> "Option Inspector"

On the search box write FontSize and then choose the size you want

Thats it - it will effect both the printing and how it appears on the screen

You need to repeat this for each cell style you want to modify. However, it is best to find a prepared style that meets your needs.

I wonder, the default font size for "Input" is 13 points. Isn't this enough?

best yehuda

You may change the magnification of the notebook you are using. Look at the lower bar

Another option (which I assume is too complex due to the very basic nature of your question) is to modify the style for the required cell formats (i.e., input and output)

yehuda