custom flags

Please read the FAQ on language switcher which explains how to.

Okay, I’ll look in the FAQ

if i want to view the flags in horizontal row?
have you a shrtcode the view the lang flags?

Ok i find the horizontal line here
https://polylang.wordpress.com/documentation/frequently-asked-questions/the-language-switcher/

Have you a [short-code?] for the lang switcher ?

There is no shortcode.