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Screen resolution during Stretch installation

Hi all!

I don't know if this is the wright place to ask, but I'm searching a lot trying to find a way to this problem.
I'm installing Debian in my Asus ROG GL552VW laptop (Intel and Nvidia video cards) and the resolution (probably 3840x2160)is set in a way  that the font size is so small that I have to almost  put my face on the monitor so I can read. And the windows size is also larger than the monitor area, so I can't see the buttons. I can complete the installation either way, but I want to know why this is happening and how to solve this.
After OS install, I try to follow Debian instructions to install Nvidia drivers. But I'm following every tutorial and ending up with a broken installation.

So, my questions:
Where I can change the screen resolution during (or before) install?
After install, resolution is still wrong. How can I set OS resolution during install?

I hope somebody could give some advice on where to go.