You can zoom out via right-clicking or by pressing the zoom button. You can zoom back in by selecting the area of the map you wish to visit and left-clicking.
你可以通过右击或者按下缩放按钮来缩小地图，通过选择你需要看清楚的区域并且左击来放大地图。
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The F9 Menu can also be accessed by right-clicking on the titlebar of a K4000RC Viewer window, or by left-clicking on the System Menu button in the top left of the K4000RC Viewer window's titlebar.