What arror are you talking about? The only arrow is the arrow that shows when you hover over the margins with the mouse, and that isnt visible ona touch screen except during an actual tap. And tapping on the left third of the screen always turns the page back. And tapping on the bottom has no special behavior, if your bottom tap is on the margin nothing happens, if it is in the text then it turns the page left or right depending on if it is the left or right.
And why shouldmosue and tap have the same behavior? They are different input devices with different semantics. With a mouse ou can show the controls by right click, anywhere. Taps dont have a right click.
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