1. To view a layer, click on the eye icon, this will enable you to toggle layers on and off.
  2. To change the transparency of a layer, make sure it is toggled on and then click on the drop icon, this will cause a slider to pop up, slide this bar to choose your desired level of transparency.  
  3. To rearrange layers, simply hover over the layer name and drag to the desired position.
  4. If needed, you can zoom to your layer by selecting the expand icon, this will take you to the whole extent of that selected layer.