All the MIDI events in the key editor

I would love a way to open easily all the MIDI events in the key editor. I use the key editor to see all the notes of my arrangement at once. But at the moment it is tedious. I have a shortcut to open all the MIDI containers between locators in the key editor. If I want to add a new instrument line, I record it. But then if I want to edit it, the selection of all the events unselects, and I need to select them again to have everything at once.

I don’t know how, but a mode with everything displayed in the key editor would be awesome