Disable a audio layer in Storyline 360

I am looking for a way to disable an audio layer. I created text-to-speech for every slide in my 70 slide course. I am using this for CC and preview audio. I am now putting in voice over, but want to keep the text-to-speech layers. I do not want them to play and cannot find a way to disable them. Seems like a very easy task.

thanks for the help