There's a limited number of columns (16) you can display in Tableau. But the default is 6. Go to Analysis > Table Layout > Advanced, and you can change the number from 6 to 16, which helps a little.
Of course, if you have 100 columns, that doesn't get you very far.
Here's another technique that can get you to more columns, but it involves a few more steps: http://www.tableausoftware.com/about/blog/2013/5/sometimes-you-have-break-rules-expanding-beyond-16-columns-without-header
Perfect! Thanks I knew it had to be something simple.