Limit to select one post

Hi
I have query to select latest post and its workign wrong and display one post from each category right now so its more than one. How can I fix that I just want the latest post only. ?

Thanks

Query here:

{
    "name": "Sticky_Three_cols1",
    "slug": "sticky_three_cols1",
    "type": "widget",
    "path": null,
    "data": {
        "display": {
            "title": "",
            "style": "unformatted",
            "row_style": "fields",
            "post_settings": {
                "size": "excerpt"
            },
            "field_settings": {
                "group_by_field": "__none__",
                "strip_group_by_field": "",
                "fields": {
                    "featured_image": {
                        "type": "featured_image",
                        "hook_key": "featured_image",
                        "name": "featured_image",
                        "weight": "0",
                        "image_display_style": "news-list",
                        "link": "on",
                        "label": "",
                        "custom_output": "",
                        "classes": "",
                        "empty_field_content": ""
                    },
                    "post_title": {
                        "type": "post_title",
                        "hook_key": "post_title",
                        "name": "post_title",
                        "weight": "2",
                        "exclude_display": "on",
                        "link": "on",
                        "label": "",
                        "custom_output": "",
                        "classes": "",
                        "empty_field_content": ""
                    },
                    "post_excerpt": {
                        "type": "post_excerpt",
                        "hook_key": "post_excerpt",
                        "name": "post_excerpt",
                        "weight": "3",
                        "label": "",
                        "rewrite_output": "on",
                        "custom_output": "<h2>{{post_title}}</h2>rn<p>{{post_excerpt}}</p>rn",
                        "classes": "",
                        "empty_field_content": ""
                    }
                }
            },
            "template_part_settings": {
                "path": "",
                "name": ""
            },
            "header": "",
            "footer": "",
            "empty": "",
            "wrapper-classes": "",
            "page": {
                "pager": {
                    "type": "default",
                    "previous": "",
                    "next": ""
                }
            }
        },
        "args": {
            "posts_per_page": "1",
            "post_status": "publish",
            "offset": 0,
            "sorts": {
                "date": {
                    "type": "date",
                    "hook_key": "post_date",
                    "name": "date",
                    "weight": "0",
                    "order_value": "DESC"
                }
            },
            "filters": {
                "post_types": {
                    "type": "post_types",
                    "hook_key": "post_types",
                    "name": "post_types",
                    "weight": "0",
                    "post_types": {
                        "post": "post"
                    },
                    "exposed_label": "",
                    "exposed_desc": "",
                    "exposed_key": "",
                    "exposed_settings": {
                        "type": "select"
                    }
                }
            }
        }
    }
}