You can undo changes that you have made in Project Task Gantt since your last save. If the Undo or Redo button is not available for selection, there is nothing to undo or redo.
To undo individual changes that you made since the last save, click Undo.
To redo the last change that you undid, click Redo.
To undo all changes since the last save:
Related Concepts
Project Task Gantt (Task Manager)
About Task Dependency Relationships and Lag
Related Tasks
Adding a Task Dependency Relationship
Deleting a Task Dependency Relationship
Editing a Task Dependency Relationship
Assigning Resources or Roles to a Project Task
Creating Resource Demands from Project Task Gantt
Associating Project Tasks with Milestones
Configuring Alerts and Restricted Editing of Project Task Constraints
Using Task Notes in Project Task Gantt
Reference