Do you have a breakout box hooked up? that's what they are for, just indication if your switch is open or closed, like a float switch. If you aren't using any of them you can take them off your display.
no breakout box. its the new apex. so i figured out that the link a & b switches are for my 2 - 24 vdc ports. waiting on apex to invent some awesome new toys for them
Another box will appear, and you can drag them in there to remove them from the home screen. And if you ever need to retrieve one, just select the padlock again and the box will pop up and you can drag them out