it'd only be available when coalitions are set as allowed in-game
basically you should be able to turn it on/off from the configuration button near chat button
it'd show the countries are inside a coalition, even with the view, it should still show the borders of each country, so you understand which one is it, it shouldn't show the coalition as a whole but as a group of countries
now that with the revamp we're allowed to Zoom Out a lot, it could be really useful