I tried that utility but am still getting all rows:

output variable name is latestActivity as array.object type

Raw input is array.object 

{
    "latestActivity": {
        "Activity": [
            {
                "Activity": {
                    "ActivityLocation": {
                        "Address": {
                            "City": "BEVERLY",
                            "CountryCode": "US",
                            "PostalCode": "01915",
                            "StateProvinceCode": "MA"
                        },
                        "Code": "ML",
                        "Description": "Front Door"
                    },
                    "Date": "20201210",
                    "GMTDate": "2020-12-10",
                    "GMTOffset": "-05:00",
                    "GMTTime": "16:41:51",
                    "Status": {
                        "StatusCode": {
                            "Code": "FS"
                        },
                        "StatusType": {
                            "Code": "D",
                            "Description": "Delivered"
                        }
                    },
                    "Time": "114151"
                }
            },

            {
                "Activity": {
                    "ActivityLocation": {
                        "Address": {
                            "CountryCode": "US"
                        },
                        "Description": "Front Door"
                    },
                    "Date": "20201209",
                    "GMTDate": "2020-12-10",
                    "GMTOffset": "-05:00",
                    "GMTTime": "00:13:55",
                    "Status": {
                        "StatusCode": {
                            "Code": "MP"
                        },
                        "StatusType": {
                            "Code": "M",
                            "Description": "Shipper created a label, UPS has not received the package yet."
                        }
                    },
                    "Time": "191355"
                }
            }
        ]
    }
}

Maybe I have the Output variable setup incorrectly?  I am attaching a screenshot of the setup I have that is still outputing all the Activity elements, not just the first one.