Does popup_menu() functions asynchronous?

I try to use popup_menu() in linear code like:

——

func PopupResult(id, sel)
    let g:popup_sel = a:result
    echo "In popup: " .. g:result
endfunc

call popup_menu(["A","B","C"], #{ callback: 'PopupResult' })

echo 'After popup'

——-

but 'After popup’ is displayed immediately, not waiting for finish the 
call. 
Does popup_menu works asynchronous? How can I execute such code in linear 
way?

Piotr

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