As far as what I do as usual practice when I am creating new reports, I do the right-click and drag the pill to the appropriate shelf and select the right option from the pop-up list. To me, converting from dimension to measure by dragging it down into a measure allows for faster locating and calculating for those specific objects. I prefer the right-click and drag to shelf method.
Hi Teresal, your Country pill cannot be a dimension if it is being summarized by Count (Distinct). It could be a discrete measure, but it cannot be a dimension. Is that what you mean?