Pinch with two fingers to zoom in or out.
Use two fingers to move the camera in Eraser, Belt, and Wire modes. In all other modes, drag with one finger.
In Eraser Mode, drag across tiles to delete all buildings on the tiles you pass over.
In Belt or Wire Mode, drag across tiles to place belts or wires continuously on the tiles you pass over.
Long press and drag to select buildings and copy them into the Blueprint Pasteboard.