[Elecraft] K3 - Squelch question

[Bruce Meier]

Having a great time with my new K3 #1062 so far !!    I have never been on 6
mtrs and decided to give it a try.    As I am working from home today I
wanted to leave the K3 on the SSB calling freq and simply monitor.     I
tried to change the RF/SQL settings to allow me to squelch the noise -
and..I can't.    Does the squelch not work on SSB or am I doing something
wrong?

Bruce - N1LN
K3 #1062 (on the air)
K3# ???? (on UPS)