Etc Ion

Highlight.

I would recommend reading up on the Highlight and Lowlight presets as well as Highlight RemDim function in setup, as Highlight I very configurable

The easiest is to select the channel and hit enter, hit the [Rem Dim] button and hit enter again.  That should black out everything except the channel(s) selected.

To restore the look you had before doing this, hit the [Rem Dim] button again before you hit anything else.

You can use the encoders to pan and tilt while in Rem Dim.

Note: Highlight as ueliriegg mentions above lets you do more and is more configurable.

Highlight is an amazing feature.

but if OP is looking to Solo a Submaster, you can set the Fader button to act as a Solo instead of the normal Bump function in the Fader Config Tab.

the down side of RemDim is that you can only use Encoders and Next/Last when in RemDim mode if you want to be able to return to the previous state. highlight doesn't have that problem