Toggle Hide Group 39
Toggle between showing and hiding channels in group 39. This command is defined, but does not exist. There are currently only 32 groups possible (Logic Pro 10.6.1)
Prior to mixing, you may find it useful to define some logical channel strip groups. You could, for example, group all drum channel strips under one drum group. This would allow you to control the group meters (volume, pan, mute, solo, sends, and so on) using a single control, while still maintaining the relative parameter values of each channel strip.