Undo is used to reverse the last operations that have been completed. Undo can be used sequentially to undo more than one operation back.
The number of Undo steps available depends on available system memory (both real and virtual).
Undo and Redo steps are only available back to the last Save, Save As or Exit with Save operations.
Please note that not all operations are available to Undo/Redo.
Shortcuts
Default Keys: Ctrl+Z
Default Menu: Edit
Command: Undo
Items Which Cannot Be Undone:
Save
Save As
Save Technology File
Import ECO
Import Netlist
Specctra or Route Editor restore routes
Import Netlist
Change Grid
All options on the Outputs menu
Any options on the Options dialogs which make registry changes
Security copies
Undo History
The Undo History menu item (under Edit) displays a list which can be used to undo or redo multiple levels in one
action when selected. The list shows a <Current Position> which is used to more easily identify
where in the undo stack you are.
The list can be used to Undo as well by clicking higher up the list
after doing an redo.