Initially, AtlasMap displays a blank canvas. You must import at least one data file into the Source panel and at least one data file into the Target panel. You can then map fields.
After you import a data file, you can remove it from the data mapper canvas by clicking the trash icon, as in the following image:
To remove all imported files, as well as all data mappings:
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Click the AtlasMap menu.
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In the pop-up menu, select Reset all mappings and clear all imported documents.
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In the confirmation dialog, click Confirm.
AtlasMap displays a blank canvas.