Q&A should not automatically show filter field

[jdegruyter]

When you add "where field is this or that", the field is automatically displayed in the chart/table, even if I don't explicit ask to "show". for example, show total dollarfield where category is something, it will automatically split the total by that category. I'm just interested in seeing the total dollars, period. In general, I don't want to see my "where" field displayed unless I ask for it (or at least a way to turn off).