Gestures
- 2-finger tap to Undo
- 3-finger tap to Redo
- 4-finger tap to show Quick Menu
- pinch-in, pinch-out to zoom
- Quick pinch-in to zoom to fit
- 2-finger swipe to pan
- 2-finger rotation to rotate
- long press to enable Eyedropper or set source location in some tools
- double tap some tool icons to perform tool's special action (deselect, reset etc.)
- double tap a slider to reset it to default value
- keep 2nd finger down to keep aspect ratio or snap angle in some tools
- long press 'Pencil Mode' icon to show pencil settings