Choose Window > History.
When working on a design in Illustrator, you make innumerable edits and changes to the document. When unsure of a particular design edit, you can go back to the previous state of the design or even move to the subsequent state and revise it. By using the undo or redo commands, you can easily control your design's states. Similarly, you can use the History option to view, undo, redo, or edit any states of your design.
The Undo and Redo options let you undo or redo changes you've made in the document, allowing you to correct mistakes as you work. After you save or reopen a document, you can't undo or redo any changes.
To undo or redo, choose Edit > Undo or Edit > Redo.
You can also revert a file to the last saved version. However, Revert option doesn't work if you reopen the file or document.
To revert the document to the last saved version, choose File > Revert.
You can also use the History panel to efficiently perform Undo/ Redo actions in Illustrator.
You can use the History panel to jump to any recent state of the design you created during the current working session in Illustrator. Each time you add any elements to the design, you can see new states being added to the History panel.
For example, if you select, draw with a pen tool, and rotate part of a design, each of those states is listed separately in the panel. When you select one of the states, the artwork reverts to how it looked when that change was first applied. You can then work from that state.
Follow the steps below to open and use the History panel:
To undo a specific change, select the state and click Step Backward from the History panel menu.
To create a new document from the selected state, select the state in the History panel and click