Sorry - what I meant by hiding sensor categories was their category titles. The only way to do this right now is to hide the entire category and its sensors below it, which isn't what I want.
I'd like to see more options to hide these things:
1) Decimal place for temperatures. All of mine display as xx.0. I don't need to see the .0 part if they're all whole numbers anyway.
2) Sensor categories. I like things to be as efficient as possible, so it would help reduce "clutter"...