• If you align the elements horizontally, you may use touch: left, middle (both touch button hopefully fire because of the fat finger - or you use two fingers) and right. You can then also implement left / right scrolling with left / right swipe when you have more items than do fit.

    From most small real estate / mobile devices we are conditioned to scroll vertically... but why not turn that horizontally since horizontal swipe is supported and there is no disadvantage in horizontal layout because the screen is square / round.

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