How to undo, redo a particular change?
The undo, redo buttons are given on the top of the right panel.
You can also use keyboard commands for undo and redo.
Undo: MacBook – 'Cmd + Z' Windows – 'Ctrl + Z'
Redo: MacBook – Cmd + Shift + C Windows – 'Ctrl + Y'
*The Redo button only appears after you've undone an action*