My main laptop that I use this on does not have a scroll wheel. I'm assuming that you can easily zoom in and out with that scroll wheel, but how can I do it WITHOUT a scroll wheel?
Or buy a cheapo mouse (or use a spare one that you have lying around if you have one) that you can plug into your laptop. Personally I can't use a touchpad at all, especially if dragging is involved, it might be easier on your fingers to just use a mouse instead.
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I can zoom in and out with the shift and the arrow keys so I'm happy.