ctrl + Z Ctrl +Z is undo for everything
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CTRL+Z is simply the shortcut key for the Undo command. To "undo your undo" so to speak, you must use the Redo command. Usually, the shortcut key for this is CTRL+Y.
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Undo last step
Ctrl Z on a keyboard undoes what you typed before.
Ctl Z does nothing (neither does command Z or Option/alt Z). In my prefs I have it set to undo up to 64 steps. I have restarted Blender, nothing. Neither the shortcut or the menu Undo command works. Google doesn't turn up anything.
Undo is Ctrl-Z. Redo is either Ctrl-Y or in some programs Ctrl-Alt-Z.
Ctrl - 2009 Ctrl Z 1-3 was released on: USA: 14 July 2009
Try Ctrl + Y. There is no common universal shortcut for Redo, although you might find the option in some programs, e.g., Adobe Photoshop.