Location: Tools menu - Options - Spelling and Thesaurus Tab.
Click on the [Spelling Options] button to display the
dialog
box that enables you to control the behavior of the spell checker.
KnowledgeWorkshop comes with a US and British thesaurus and additional versions can be downloaded. Enter the location of the thesaurus file you wish to use in the text box or click on the browse button to select it from your file system.