Right-Click on the Control Panel...

[Ulug Beg]

Yes this is very handy for locating all your agents, which you can't see on the map if they are in a settlement or army. And for a summary of all your cities.

You would think it would be in the "Settlements and Control Panel" section but its actually mentioned in the beginning "How to get Started". Very easy to forget this if you did read it before getting started. I only noticed it after re-reading to pass the time on the train, and after playing for a bit it now made instant sense.