Toggle Hide Group 21
Toggle the visibility of all channels in group 21.
Deselect Mix > Groups Active (or press Shift-G).
Always good to know about the “group clutch” which has fallen out of favor as a term. People don’t know what a clutch is any more 😉 When you’re not sure about the change you are going to make push in the clutch so the change will only affect the current channel, not all channels in the group.