In the UA Console how do I commit the mono output from the Sphere plug-in?

Starting with the Sphere plug-in on a stereo channel, select UAD REC mode in the UA Console, so that the processed audio will be recorded in your DAW. If using the UAD Sphere plug-in (and not the stereo output UAD Sphere 180 plug-in) you can then just record the left or right output of the stereo channel into your DAW. The end result will be just like recording a conventional mono microphone into your DAW.

Here's a discussion of Console workflows with Sphere from one of our Q&A sessions: