If you have the plus model it's sweet!
The left column is an adjustable zoom that you can swipe up or down in the water column and pinch to zoom in or out. You can see the box on the right column showing where the zoom is.
You can tap on the range, the gain, or the cone angle to open up a sidebar and change those settings.
I just took a pic of it in simulator mode; I'll try to get a decent screenshot next time I'm on the ice.