SP List Header - New Item shows user display name at Adding or Editing item

leonardbd Use .title instead of .DisplayName. I just tested and it is working fine for me. Also, make sure you are using correct internal name of your people picker column in JSON. You can get the internal name of your column by following this article: How to find the Internal name of columns in SharePoint Online?  

{
    "elmType": "div",
    "attributes": {
        "class": "ms-bgColor-green"
    },
    "style": {
        "width": "99%",
        "border-top-width": "0px",
        "border-bottom-width": "1px",
        "border-left-width": "0px",
        "border-right-width": "0px",
        "border-style": "solid",
        "margin-bottom": "16px"
    },
    "children": [
        {
            "elmType": "div",
            "style": {
                "display": "flex",
                "box-sizing": "border-box",
                "align-items": "center"
            },
            "children": [
                {
                    "elmType": "div",
                    "attributes": {
                        "iconName": "MobileSelected",
                        "class": "ms-fontSize-42 ms-fontWeight-regular  ms-fontColor-white",
                        "title": "Software Name"
                    },
                    "style": {
                        "flex": "none",
                        "padding": "0px",
                        "padding-left": "0px",
                        "height": "36px"
                    }
                }
            ]
        },
        {
            "elmType": "div",
            "attributes": {
                "class": "ms-fontColor-white ms-fontWeight-bold ms-fontSize-24"
            },
            "style": {
                "box-sizing": "border-box",
                "width": "100%",
                "text-align": "left",
                "padding": "21px 12px",
                "overflow": "hidden"
            },
            "children": [
                {
                    "elmType": "div",
                    "txtContent": "=if ([$Title] == '', 'New Item', 'Request of: ' + [$Requestor.title])"
                }
            ]
        }
    ]
}

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