How Not to render visible

i want to define this function not to render as default. Right now with connect with html template i am seeing this field as default, how to not make as default visible

    def check(self, obj):
            return format_html(
             "<ul>{}</ul>",
             format_html_join(
               "\n",
                "<li>{}</li>",
                 obj.tee_rates.values_list(
                     "tee__name__chek__short_name",
            ),
        ),
    )

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