Hello Mike,
Layers appear in the order in which they were created, so it's not possible to re-order layers after they've been created. You would need to delete the upper layers (by clicking 'x' next to the layer in the Edit This Schedule view) and recreate them as new layers, in the order in which you want them to appear.
If you'd prefer to use moveable layers I can submit this as a feature request to our Product Team, at your request.