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

    DirectRecipientPickerInputSchema: Union<
        readonly [
            Undefined,
            Struct<{ mode: Literal<"group">; searchSessionId: String }>,
        ],
    > = ...

    How the picker was opened: undefined is the inbox's "New message", and { mode: 'group', searchSessionId } is the picker's own "Group chat" row — the same fragment re-entered in group mode (the 451 app names the identity at both ordinals, direct_recipient_picker:3:button then :4:button), carrying the visit's search session on.