In QGIS 2.18, I have a symbology of points in a layer based on rules. I want to control the rendering order of the layer in QGIS, with on top the type with the lower counts. Intuitively I would expect to observe a rendering order modification by drag-droping the types, but this does not occur. A related question is of no help.
As you can see on the image I have tried using the "control features rendering order" but without success.
How could I do?