Author includes a scale bar to help you determine the scale of your data at different extents. The scale bar is displayed by default and uses default settings for map, scale, and screen units. You can remove the scale bar from the display and change the properties for units.
The scale bar is a utility while you are using Author and is not saved as part of the map configuration file.
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By default, the map units are set to decimal degrees in Author. If the scale bar values do not seem correct, check if the map units under the scale bar properties are correct.