Recording from the USB on an Allen & Heath QU-16

We have just set up an Allen & Heath QU-16 digital mixer to record our church services. I want to record all the tracks from the board into one track in Audacity. Does anyone know how? I have been able to get 1 channel to come through on the left channel in Audacity, but can’t figure out how to combine all into one. Any help would be appreciated.

That’s going to be down to settings in the mixer.
Have a look at the manual, and if you can’t work it out from that, try the Allen & Heath Tech support (