Or, if you need certain fields on the right side, leave them and on the Column tab on the right, change the Width to 0%. This will not display data for that item then.
But what I think you're asking is to only show the total. I believe the only way to do that is check "Summarize Totals for Collected Tables" on the same tab. I can't remember if you can have everything set to 0% Width and have this work out the way you want. You can play around with it and see what you need.