uMake lets you undo/ redo steps with ease. Accidentally moved a curve or surface? Tried creating a curve but didn’t like the result? No problem, use the undo/ redo buttons to simply undo or redo the most recent actions.
The Undo/ Redo buttons are located just above the Orbit button, indicated by curved arrows pointing to the left and right. The undo button points to the left, while the redo button points to the right.
uMake gives you unlimited undo’s from when a file was opened. If you exit out of a file, and then open it again, you will not be able to undo actions taken in the previous session.