Undo toolbar

ClearUndo
Clear the undo buffer to free memory.

Undo CPlane
Set the construction plane in the active viewport to the previously used construction plane.

Redo CPlane
Set the construction plane in the active viewport to the next construction plane.

UndoSelected
Reverse recent changes for a single object only.

UndoMultiple
Display a list of recent commands to reverse.

RedoMultiple
Reverse the Undo command multiple times.