You can easily correct mistakes, restore your work to an earlier state, and repeat commands using the Undo, Redo, and Again commands. The minimum and maximum number of times you can undo changes can be changed within the Configuration Center. (See Setting Preferences.)
Canvas X Draw uses memory to store operations so they can be undone. The amount of memory depends on the operation; e.g., undoing a filter applied to a 2 MB image requires significantly more memory than reversing a change in type size.
Canvas X Draw allocates memory to ensure that you can undo the specified minimum number of actions. Canvas X Draw tries to set aside enough memory so you can undo the specified maximum number of actions. It uses this memory if it’s needed for other operations. Therefore, you should be able to undo the specified minimum number of actions, but you might not be able to undo the specified maximum number of actions. The memory allocation ensures that you’ll have the most memory available in Canvas X Draw.
Do one of the following:
Not all actions can be canceled with the Undo command. Actions that cannot be canceled include scrolling; closing or reverting to an earlier version of a document; selecting and deselecting objects; deleting settings in palettes; and saving documents.
Do one of the following:
Choose Edit | Again.
When an action can be repeated, the Again command includes the name of the action; e.g., after you rotate an object, the Again command appears as “Rotate Again.”
Not all actions can be repeated. The Again command isn’t available if the previous action can’t be repeated.