This page allows you to define a scale to be added to the bottom of the printed image. If you change the scale value, the margins are updated to match. The scale is defined as either one inch or one centimeter, and will equal the specified number of units that your data are in. This could be feet, meters, lat/lon, etc. If, after the scale is set, you zoom in or zoom out, the scale will change to match the new world boundaries and the page margins.
The preview window shows a sample of what the printed image will look like.
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