Options are accessible from either the top menu, Edit -> Options, or the side menu, Preferences -> Options
General Settings: Settings for DemandTools as a whole. Click HERE for full details on General Settings.
File Paths: Full pathnames indicating where Single Table Dedupe Scenarios, Master Rules, Log Files, Restore Files, and Replace Lists etc. are stored. Click HERE for full details on the File Paths tab.
CSV File Options: Additional settings when exporting to csv files. Click HERE for full details on the CSV file options.