Try a change before you make it
Turn on What-if, or press W, to try planning changes without saving them. Apply saves them.
Turn it on
Section titled “Turn it on”The What-if button, a flask icon, is in the toolbar of list, Gantt and schedule views, and in the item details header. The mode covers the whole browser tab, and an amber frame shows it is on.
Try changes
Section titled “Try changes”Change Start, Finish, Duration (d), Estimate (h), Assignees or a dependency. On a schedule, you can also set hours and reserve time. ⌘Z or Ctrl+Z steps back through your proposed changes.
Review and apply
Section titled “Review and apply”- Choose Review in the bar at the bottom.
- Under Your changes, untick a change to see the plan without it.
- Choose Apply. The ticked changes and what they move are saved, and the mode turns off.
Leave without saving
Section titled “Leave without saving”Discard or Discard all turns the mode off at once. The button and W ask first when you have changes.
When someone else changed the same value
Section titled “When someone else changed the same value”Review shows Changed by someone else to and the new value. Choose Overwrite to keep your value. Apply waits until you do.