igpapi — Instagram private API Simulator for Node.js (API reference) 4.14.0
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    Variable DirectForwardingSheetThreadSchemaConst

    DirectForwardingSheetThreadSchema: Struct<
        {
            is_group: Boolean;
            thread_id: String;
            thread_title: String;
            users: $Array<
                Struct<
                    {
                        fbid_v2: optionalKey<String>;
                        full_name: String;
                        pk: String;
                        username: String;
                    },
                >,
            >;
        },
    > = ...

    One conversation the forwarding sheet offers: its long id, its title, whether it is a group and its people (the row shows their avatars). The app reads them from its local inbox store without a request, so the sheet's list is the store's head.