How did the narrator switch between running game and see-through console type in window?

Hi,
I am watching the following video and want to know how the narrator was able to switch from the game view to a console input see-through view and enter console input?

What key stroke was used as I don’t see a mouse click?

The first instance is at 27:10 in the video, and is used by the narrator several times later.

Thanks!

F1

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Thanks!