To lid or not to lid?

I'm currently making a plain chicken broth with the carcasses. It's currently at a low simmer and will be for the next few hours.

If I place a lid on the pot, will it affect the clarity of the broth somehow? I have in the back of my mind that placing a lid can make it cloudy for some reason, but I'm not sure if my mind is making up things or if this is a cooking myth or if it is actually the case somehow.

Leaning towards either cooking myth or my brain making things up again.