You can use Simulink® Preferences to specify Simulink editing environment options and default behaviors. Your settings affect the behavior of all Simulink models, including those currently open, and all subsequent models. Your preference settings are preserved for the next time you use the software. The Simulink Preferences window has these panes:
Set preferences for generated file folders; background colors for print or export; Model block, callback, and sample time legend display.
Configure the Simulink Editor.
Set preferences for file change, autosave, version notifications, and other behaviors relating to model files.