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Click back and forth between the tabs to verify the column order, then click on a header and drag and drop into the desired order. This moves not only the header, but also the data below it.
Common Column Editing Questions
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What if I have too many / too few columns in my .csv to match the Section Grid?
If you see any of these issues, proceed to Step 4 - Edit data as needed.
Otherwise, if your columns match up perfectly and none of the data needs editing, skip to Step 5 - Drag rows to the Section Grid