Undo and redo

The document history

The same commands are in the toolbar and at the top of the right-click menu. The toolbar buttons are always enabled (with nothing to undo they do nothing); in the menu the items are disabled.

• Every operation is a step: drawing an object, moving it, entering a value in a field, a menu command.
• A dragged slider is a single step, however many movements it takes.
• A gesture with the color picker is a single step, until release.
• An operation that creates several things at once (a boolean operation, a modifier, an automatic layout) is a single step: one undo removes all of it.

When you undo, you get back the selection there was before the step; when you redo, the one the step had left. Objects that ended up in the trash or outside the document do not come back selected.

With the Pen tool every point you place is a step: ⌘ Z removes the last point instead of discarding the path. Once the path is finished, the steps of the single points disappear and a single step remains, the one that created the object.

With a text open, ⌘ Z and ⌘ ⇧ Z work on the text's own history: letters typed in a row are one step, an applied style is another. When you close the text, a single step remains in the document history.

Inside a panel field, ⌘ Z undoes what you are typing in the field, not the document.