The Display tab of the Compilation Conditions Browser preferences appears as in The Compilation Conditions Browser Display preferences.
Figure 10.3 The Compilation Conditions Browser Display preferences
This tab includes the pathnames selection area, which has two radio buttons.
Check Show Full Pathname to show the full pathname of all files displayed. This is the default setting.
Check Show Leaf Pathname to show just the filename of all files displayed, and omit the full pathname.
LispWorks IDE User Guide (Windows version) - 25 Nov 2011