A fixed 12 point lettertype is used for printing. You need to make sure the log fits the paperwidth by either selecting the correct style or selecting a magnification factor in the "Page Setup" page of the print dialog. You can also select columns to print in the "Columns" page of the same dialog.
The print dialog allows you to choose a configured printer and change it's settings, but you can also print to a postscript or pdf document in a selected directory.