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The ability to control the .csv exports column order is not currently built into Tableau Desktop. I would suggest up voting the following idea to show support for this feature: https://community.tableau.com/ideas/2754#comment-21253
There is a partial workaround in the following blog post: The Greatest Tableau Tip EVER: Exporting CSV made simple!
Additionally, this community thread contains additional comments and suggestions for overcoming the issue: data export column order
I hope this helps!