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Executing Set print areas tool will force Earthlight to display slightly different Map view. In this mode you can configure both map views (Main and Inset).
The modified map view contains 7 elements:
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This is how both of the scale bars properties windows looks:
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Now please go to the Map tab and click the Print button.
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As you can see, both of the map views are showing the area marked by Main and Inset fields and the scale bars below them are showing the different scales – the left is for Main map, the right is for Inset.