Where is the undo option in the new omnibar

Not sure if I’m missing something here, but I am unable to find though undo or redo options in the new OmniBar. Are use remnote mainly via Apple Pencil in my iPad. So I do not have the option to press Control Z. Can you please advise how I undo an error without an external keyboard?

I believe on Apple devices, there are some touch gestures that work to undo/redo — Three-finger swipe left to undo and three-finger swipe right to redo. Does this work for you?