Show/Hide Grouping – Logic Pro keyboard command of the day

  Show/Hide Grouping

Shows or hides the Group indicator in the mixer windows. Save some vertical real estate on the mixer channel strips.

Overview of groups in Logic Pro – Apple Support

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.