Maybe I am blind , but I cannot see how to play music from usb stick when everything is sorted by folders. Bunch of different options - by genre, artist etc.. But where is simplest way playing by folders? Can someone point me to right direction ? Or this option is not exists anymore ?

You need to go compleatly back.. Then you select usb stick and you can see folders.. And then you select your folder which you want to listen. 

That's how it's working on my Karoq on MIB2. Not on Skoda's MIB3 :( on my Kodiaq
Unless something is hidden