How to display second screen

In yuzu how do I display secondary screen.
I have Pokémon Let’s Go Eevee.
It shows me a screen for choosing the type of controller.
Then there appears to be an intro but my screen is black.
It asks me for the language.
Then I see Prof. Oak that asks my name, but I don’t see where to put my name.

I tried almost all keys of my keyboard and not found how to view the second screen.

A second screen? You know what a Nintendo Switch looks like… right? In any case, you need to get a save file at to get the game to work properly.

Nop, I really don’t know how it looks.
I will try finding a savegame.