Hp envy disable touch screen

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I use Windows 8.1 and have an HP Notebook 15. How do I disable this? I've tried going into mouse/touchpad settings but there isn't any option about changing the zoom.

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While typing on a browser, my screen zooms in and out periodically, and I'm sure it's because I'm accidentally touching something. HP Display :: How To Disable Zoom From Touchpad On 15 Notebook Oct 5, 2014