Hi Gloria,

1. First we will just point out some general Limitations for our Export Tools :

The table tools functionalities are based on a 3rd party HTML5 library and they are not customizable. 

There are some limitations in this library we will emphasize for your awareness:

• For tables with server-side processing enabled, only the visible rows will be exported to any format.

 If you want the entire table to be exported while having "server side" feature enabled in it (or copied to a clipboard), you need to choose the “Show All” option in the “show … entries” block, and then do the export:

• Generated PDF, XLS, CSV are not customizable. Unfortunately, the library allows very little “fine-tuning” of the generated files, so font, size, and other properties cannot be changed (but the title can – see below).
• Conditional formatting is not reflected in any of generated export files.
• Other front-end extensions cannot be combined with Table Tools. If you have row grouping enabled for the table, or there are some customizations you did yourself, they won’t be reflected in the generated Excel, CSV or PDF document, nor in the clipboard.
• When you export tables with the wpDataTables plugin, please note that you can export values, but not formulas. WpDataTables doesn’t support exporting formulas, so a Formula column will be exported only with values; and any calculations of Average, MIN, MAX, and Total will not be exported at all.
• Exporting images is not possible at the moment, but you are able to export them as HTML with the new “Include HTML” option.
• You can not export columns that are hidden – they will not be visible in any exporting or printing tool.
• Export numbers with comma as decimal separators have issues in the Excel report. Please use the CSV export button or change column type to string for these columns.

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If you need better PDF export options, our advice would be to acquire something like the WP Advanced PDF plugin, which offers a lot more options when creating PDF files from our tables, along with other content on your website.

So, as you can see, in one of those limitations, it is not possible to export any column you might have hidden - whether if it was by hiding it from the Column settings;

or if you use CSS to hide it - our Export Tools will only show the visible Columns from a Table.

At the moment,we don't have any way to change that, but you can make a development suggestion.

Please feel free to search on our suggestions page, 

 to see if someone may be already suggested this feature. If you can't see it, feel free to add your suggestion there,  and as more people vote, the feature will move higher on the priority list.

You can certainly follow our changeLog page if you'd like ( it is also available in the plugin dashboard), where we state any changes/new features/bug fixes during updates;

and our newsletter, so you're informed about new features, bug fixes, freebies, etc.