See solution in other versions of Excel:
Question: On a pivot table, how do I remove grand totals for columns in Microsoft Excel 2011 for Mac?
Answer: Below we want to remove the grand totals for the Order ID columns.
To remove this column grand total, select the PivotTable tab from the toolbar at the top of the screen. Click on Layout button and select Show Totals for Rows from the popup menu. This will uncheck the Show Totals for Rows option.
Now when you return to the spreadsheet, the grand totals for the Order ID columns will no longer be visible.