Play store app Asus Router gives Wi-Fi a big boost

I've just downloaded the play store app called Asus Router, and after enabling Wi-Fi ECO mode, my Ac56u has now a stronger Wi-Fi. The option itself is supposed to lower the signal, but actually the result is that my Wi-Fi network now reaches places where before it wasn't available

Any other having noticed this boost?

Merlin, can you detect what does this option do to my router?

Thanks