It remains a mystery why to this day it still hasn't occurred to anybody to put up a big board with departure platforms anywhere in Zagreb bus station.
It's a huge station, and every time I have to go ask at the information window where my bus is leaving from. Pro tip: if it's a busy time, do not leave this to the last minute.
(happy to be back in the land of krompirusa though, eh. Even mediocre Croatian bus station 'burek krompir')