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I believe you are referring to changing the width of the Matrix field, found on your form 61646660318155, which is named "National Register Board of Directors Application (Term to Start Jan 2017)".
The reason that your table cannot get any wider is that existing styles on your form are setting a max-width for matrices to 276 pixels. Even though you have set your Matrix field to width of 3000 pixels, the max-width value overrides it and does not allow the matrix field to go past 276 pixels of width.
To remove the max-width setting, you can simply add the following small bit of custom CSS into your form:
You can add CSS codes to your form by following this guide:
Since the properties of your Matrix field are also set to width of 3000 pixels, this will cause your Matrix to become very wide. I would also recommend clicking on the Matrix field's gear-shaped icon, Edit Properties, and remove "3000" from Table Width:
Please let us know how it goes, or if you need any further assistance with setting the table width.
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