Toggle Hide Group 37

Show or hide the channels in group 37. There is no group 37. The maximum group number (currently) is 32.

Edit group membership in Logic Pro — Apple Support

You can add a channel strip to, or remove a channel strip from, single or multiple groups. You can also temporarily disable all group parameter links—applying a Group Clutch—to change the volume of an individual channel strip, for example.

Hiding groups hides channels in the mixer, and associated tracks in the Main Window.