Undo comman in CAD is the command to cancel a command that has been done. Below is the way to use the command:

• Menu: Edit –> Undo
• Command: undo or U
• Shortcut key undo: Ctrl+Z

Undo command is to cancel alternately the commands that have been done before.
Command : U ↵ to start the command then ENTER

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Good luck!

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