Whether your contacts are on your phone, in iCloud, or in Gmail (cardDAV), this tool allows you to manage your different address books as easily as with a Mac.
By default, it is always the account designated as the default account in Settings that will be used.
Thee active account is the one that you are currently managing accounts for.
A circle indicates that you can select this account to manage its groups.
Un circle made of dashed line indicates that this account is not compatible with iOS groups management.