arch linux when use multiple screen

maybe if you use my bash script when you setup arch linux and wonder how to connect a multiple screen.
I only have 1 extra screen to show you that I am connect an extra screen to my laptop but at the first time my laptop will not send the display signal to an extra screen that I just plugged in so I have to use the program call ARandr to make this work
my bash script :
github.com/farookphuket/simpl...
the setup video:
• Arch Linux Install 202...