Depends of course! Instead of asking for a number of circles, observe how well the circles are functioning. Do the aims and domains feel overwhelmingly big and a significant part of it never gets attention? Do you find yourself in meetings where half of the agenda items aren’t relevant to half of the circle members? Are there many people in a circle? Are meetings very long with overfull agendas?
If too many of these are true, forming sub-circles might be worth exploring.
For more information, check out our handbook Many Voices One Song chapter 2