Thank you for the very rapid reply. The responsive slicer is what I am doing. But if I make the rows any shallower, the slicer changes to a single row yet as shown in the screen shot the month box is nowhere nearly full vertically
@Nickj - have you considered the Chiclet slicer? There is a lot more customization available for that.
here is a screenshot of the standard slicer that is in PowerBI, with the Chiclet right next to it. I turned on backgrounds for both.