Stacked bar charts


Are there special requirements for making Stacked bar charts? I want to make stacked bar chart but Metabase does not offer me such option. I read it is possible, but such option does not come.
Here is how my result looks. What am I doing incorrectly?


In the Display tab, there’s a stacking option


I don’t know how I did not notice it. Thanks a lot, works really nice.