The undo and redo option allow you to undo or redo an action on your document.
Undo
1. Go to the toolbar in the Lumin PDF editor
2. Select the left-pointing arrow to undo your last action (press multiple times if you need to undo multiple actions)
Redo
1. Go to the toolbar in the Lumin PDF editor
2. Select the right-pointing arrow to redo your last action (press multiple times if you need to redo multiple actions)
Tip: You can also use a keyboard shortcut to undo an action
Undo 
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Mac: Command 'Z' Windows: Crtl 'Z' |