If you want to turn off the Link Advanced LEDs but keep your security system up and running, go to: Menu > My Equipment > Link Advanced > Indicator Lights and deactivate the option (switch button to unchecked, see how to describe it).
With this configuration, the LEDs remain off as long as everything is normal with the security system.
As soon as an anomolie is detected, the LEDs light up again: What do the LED colors mean on the Link Advanced?