[TOnlineAsyncOpHandle](API\Plugins\OnlineServicesInterface\Online\TOnlineAsyncOpHandle)< [FLeaveLobby](API\Plugins\OnlineServicesInterface\Online\FLeaveLobby) > LeaveLobby ( [FLeaveLobby::Params](API\Plugins\OnlineServicesInterface\Online\FLeaveLobby\Params) && Params )