Open/Close Audio Insert 9 Plug-in Window of focused Track

Toggle the visibility of the window for audio insert in the ninth slot. NB the focused track is

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

In Logic Pro, click the center area of the plug-in slot.

Select tracks in Logic Pro — Apple Support

When multiple tracks are selected, only one can have focus. You can change the focused track while keeping the multiple selection using the track numbers.