The 3D Layout Settings tool is used to set project and user specific settings beyond settings found in Options. The settings include what parts should be used by default, what Part_Type values the software will filter for on certain dialogs, etc.
The settings on the Project Settings tab of the 3D Substation Layout dialog are stored in the TDSProjectSettings.xml file.
The settings on the User Settings tab of the 3D Substation Layout dialog are stored in the TDSUserSettings.xml file found in the user application data folder for Bentley Substation.
Part_Type filter values