Designating Capital Cities in World Builder

Apologies if this is the wrong place,

I'm having some fun in the SDK but I haven't figured out how to designate cities "capital" once I've plonked them all down - it's on an Earth map and I'm trying to recreate a realistic representation of cities, except I had the lack of foresight to place them at random and trust to being able to change it later on.

Anyone know? Thanks

Edit: I should clarify that, for example, I placed all the British cities, but placed London first where Manchester should be, and York where London should be. I've renamed them to their real-life counterparts, but how can I make new London, formerly "York" the capital?

You may just have to edit a palace into the city to do that.

Oh, is a city's "capital" status dependent on whether it has a palace or not? That sounds good, I'll try it - thanks!

I'm not sure, but that might work.