Similar to many applications, Simulink® Project enables you to Undo and Redo, to back out recent changes.
Click the arrow next to the Undo or Redo button.
Select the actions you want to undo or redo. You can select multiple actions. Hover over each action to view details in a tooltip.
If you are using source control, you can revert to particular versions of files or projects. See Revert Changes.