I/O tracks in arranger view - How'd I do that?

Cubase
1

I noticed that in my arranger window appeared folder track with all input/output tracks in it. I have no idea how it got there. I must have pressed something. But it could come handy, in case I need it.

How do I put it there, when I need it? Is there a shortcut, that puts it there? Or some command?
Who knows, pls let me know.

2

Turn on write automation for that track and it will appear in the project window.

3

Yes, thats it. Thnx.

Actually I clicked “Toogle Write for all tracks”, and all i/o tracks appeared in project window. Useful.