On large systems you may have a high number of channels available to select. To help with this, immediately below the "Group Title" there are three buttons labelled "All", "None" and "Invert". These buttons directly manipulate the channels selected and allow faster creation of groups. Below is a short description of what each button does.

The "All" button selects all the channels available to you.

The "None" button deselects all channels.

The "Invert" button inverts a selection you have made. For example if you have four channels selected and you click the "Invert" button, every channel but those four would now be selected.