How do you unassign an input channel to the Main LR? I can’t seem to find where to do this. I have an ambience mic on a input I have planned to use for the livestream mix (post fade) and want to be able to unassign the input to the Main LR but of course include in the mix. Can this be done?
Not totally understanding your use case and question. But, as far as I know, you can’t “unassign” anything. You also can’t “mute” the channel as that mutes it to everything. What you can do is turn the fader to the Main L/R output all the way down, while leaving it up for other outputs. In the fader screen, select the “sends to” dropdown and select which outputs you want and you can mix differently to each output. The one problem with this, which is a bit of an oddity, is if you turn down the fader to the Main L/R, you will lose all FX going to the other outputs. Or simply don’t connect anything to Main if you’re not using it and/or you can mute the Main L/R if you’re not using it for anything else.
There are some routing quirks in this system that are a bit head scratching. But they don’t get in the way of most use cases as long as you understand them.
everything goes to the main l/r post fader.
you can dance around it by sending it 0db to say, aux1, and using the aux fader, then send you other stuff to aux3+4 and use a3/a4 as your “main l/r” and ignore main l/r!
its a real pain to not be able to remove something from the main l/r bus 
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I work in a lot of smaller clubs where the snare is the loudest thing coming off the stage and also bleeds into every other microphone on the stage…
I’d like to send the snare to the reverb but doing so also sends it to L-R!
I’d like to NOT send it to L-R but still send it to the 'verb.
In Mixing Station and on the B’ringer software on my old XR18 you could simply ‘un-assign’ it to the Main out.
As I tried to explain you in your other topic:
The Mixing Station can do this on the Behringer because it has this feature:
… but the CQ doesn’t have a Main On:
In a pinch, you could, however, work around it by setting your FX send for the snare very high - perhaps even to maximum - and the snare’s main mix very low, so that it’s barely noticeable in the LR.