Remove Sitelink Search Box

Hi everyone,

I got a website wich does not have a Search-Function and Yoast SEO Plugin enters the following in the head of the page:

<script type="application/ld+json">{ "@context": "https://schema.org", "@type": "WebSite", "url": "https://www.xxx/", "potentialAction": { "@type": "SearchAction", "target": "https://www.xxx/?s={search_term}", "query-input": "required name=search_term" } }</script>

As a result I get a soft 404 in the Webmasters Tools.

How can I remove the code from the head?

Thanks a lot in advance and all the best
Hony

https://www.ads-software.com/plugins/wordpress-seo/