You now select the Editor font preference option by Preferences... > Environment > Styles > Editor Font .
The Editor Font preference takes effect only if you select Override the system default font . Then an area displaying sample text in the current preference font become active, and you can choose a new font by double-clicking on the sample text.
The Editor Font preference setting now affects all Editor tools and other tools based on
capi:editor-pane
such as the Listener tool.
There are no longer options for applying the setting only to current Editor windows or the current window only, as in LispWorks 5.1.