The default schematic model settings are stored in your PDMSEXE\SchematicModelSetting.xml file, this file points to SchematicSymbols.xml. By clicking on the Save to defaults button, the settings will be saved in PDMSDFLTS\SchematicModelMapModuleUserSettings.xml. If there will be more modules, their settings will be saved in the same location. The file name will be <ModuleName>UserSettings.xml. Next time when running the application the settings will be read from PDMSDFLTS. To reset custom settings please remove all <ModuleName>UserSettings.xml files from your PDMSDFLTS. Note that the system will also save the settings for symbol. The file name will be ModuleName>UserSymbolSettings.xml in schematic module case, this name will be SchematicModelMapModuleUserSymbolSettings.xml