In the Preferences you can view and set preferences for many functional elements of MotionBuilder, organized by different category. to view and set default preferences.
After modifying the options in any of the Preferences window’s panes, click OK to activate the changes. Changes to the MotionBuilder Preferences get saved to the Application.txt file located in the config directory. For example:
C:\Users\<username>\Documents\MB\<version>\config.