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I does the official way as Palm documents.
I did experienced with two-hand method, essentially push from two sides up. However, I think that contributed to the loose slider and Oreo effect. I found when I don't pay attention, one of my hand tends to push hard, which creates an uneven force and forcing one end to the side. Also push from the sides tends to create forces that push the top half upwards.
But I must say, using the thumb on screen method is hard when the slide was tight and screen was slippery.
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