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Two-finger rotation. On a touch screen, turning two fingers turns the
board about the point between them, live. Rotation starts locked: a turn
under 12° does nothing (every pinch turns a little), a turn past it
unlocks — a toast says so — and the board turns on from there. The angle
is kept when the fingers lift, snapped to the nearest right angle when
within 10°; the rotate buttons step to the next right angle from any
angle. A double-tap with two fingers locks rotation again and squares the
board. Settings ▸ Performance & Debug ▸ Two-finger rotation turns it off,
and the unlock angle and the snap window are sliders there (a snap window
of 0 never snaps). In Butterfly the whole spread turns as one picture.