reno/themes/unity_mate/config/root_menu.json

{
    "list": [
        {"widget": "widgets.base.popuptitle",
            "options":{
                "title":"Reno Unity"
            },
            "vertical":true
        },
        { 
            "list": [
                {"widget": "widgets.base.tagswitcher",
                    "screen":true
                },
                {"widget": "widgets.rootmenu.controls"},
                {"widget": "widgets.xdgmenu",
                    "options": {
                        "exclude_category": [
                            "Other"
                        ]
                    }
                },
                {"widget": "widgets.rootmenu.buttons"}
            ],
            "vertical": true
        }
    ],
    "vertical": false
}