reno/themes/default/config/titlebar_top.json

{ 
"align": {
    "left": [
        { 
            "builtin": "iconwidget",
            "client": true
        }
    ],
    "center": [
        {
            "draggable": true
        },
        {
            "builtin": "titlewidget",
            "client" : true,
            "options": {
                "align": "left"
            }
        }
    ],
    "right": [
        {
            "builtin": "minimizebutton",
            "client": true
        },
        {
            "builtin": "maximizedbutton",
            "client": true
        },
        {
            "builtin": "closebutton",
            "client": true
        }
    ]
}
}