Choose Tools > Preferences... or click to raise the Preferences dialog. This dialog is used to specify:
The tool-specific options are described in the chapter relevant to each tool.
The remainder of this section describes the general environment options. To see these, ensure that Environment is selected in the list on the left side of the Preferences dialog, and select the General , Emulation , Styles , and File Encodings tabs.
In all cases your setting is preserved for future use after you click OK to close the Preferences dialog.
LispWorks IDE User Guide (Windows version) - 25 Nov 2011