How to disable cropping of the image when creating a talk?

How can I disable cropping of the image when using the API I have tried "align_driver": False, in the config but it still crops the image when creating a talk

Below is my payload

payload = {
    "script": {
        "type": "audio",
        "subtitles": "false",
        "provider": {
            "type": "microsoft",
            "voice_id": "en-US-JennyNeural"
        },
        "ssml": "false",
        "audio_url": audioURL
    },
    "config": {
        "fluent": "false",
        "pad_audio": "0.0",
        "align_driver": False,
        "sharpen": True
    },
    "source_url": imageURL  
}