Q: How can I view images at specified scales such as [1/160000, 1/50000, 1/20000, 1/10000, 1/4000, 1/2000]?

A: In the Map Properties window, click Bounds, check Fixed Scales and specify a group of scales for map viewing. You can click the mouse once or scroll the middle mouse once button to zoom in twice the map. If the scales are not increased or decreased by a multiple of 2, it is best to zoom in by dragging a box.