Official comment
The fixture "label" is to tell it which pattern of the macro it's going to receive.
If you had 4 moving heads, you could assign them all as Moving Head 1, but then they'll all do the same thing. If you assign them 1, 2, 3, and 4, the macro provides different movement, fade, and colour information based on which fixture it is.
If you want to edit one of the macros, just go into the editor.
If you want to scroll the window, just scroll using your mouse or touchpad.