I have an organic groups installation with the newish "complex" field widget. This appears on both users (to manage user group membership) and on content (to manage the groups it appears in). It has separate "Default" and "Administrator" widgets within the "Group membership" field, and it seems like groups appear in the default or administrator widgets depending on the current user's permissions. I don't understand what configuration or permissions control this, or what it means for a particular user to reference a group using the "Administrator" widget vs. the "Default" widget. I've attached a screenshot of the widget.
How does it affect functionality to reference a group using the two different parts of the widget? Is there existing documentation that explains this? If there isn't, I'd be happy to develop it once I have enough information.