Fold Audio Channels Into Mono

In Livestream Studio, your audio setup can be set to either mono or stereo. 

To fold all of your audio channels into mono. Go to Settings: Advanced. In the Project Audio Format drop-down menu, select 48kHz Mono.

Now all of your audio inputs will be in mono. You can see this by going to the Inputs tab, then select the gearwheel that corresponds to the desired input, then select Audio.