Hi @bianca6 ,
Kibana has a drill down functionality that makes dashboard intractable.
You did not specify your Stack version, so I'm not able to confirm if it is supported.
Still there are multiple ways to achieve your goal on older stack versions, e.g. using filters or for example creating a complex pie chart splitting it by country and city, or create 2 pie charts
Let me know if I that helps you.
Regards, Dima