Open/Close MIDI Insert 4 Plug-in Window of focused Track – Logic Pro keyboard command of the day

  Open/Close MIDI Insert 4 Plug-in Window of focused Track

Opens the fourth MIDI Insert for the currently selected (focused) track.

Work in the plug-in window in Logic Pro – Apple Support

You edit plug-in parameters in the plug-in window, which opens automatically when you insert a plug-in.