Need to disable lazy-load for all featured posts images

Dear Support,

running a page or post like:

https://www.stiftung-meeresschutz.org/die-verschmutzung-der-meere/ballastwasser-uebereinkommen/

through PageSpeed Insights, one gets a red alert diagnose for:

„Above the fold“-images loaded with lazy-load  whisch causes a delay and affects LCP (Largest Contentful Paint) score

I asked Word Press Optimize support  how get rid of this. They recommended to get in touch with you asking to modify the the_post_thumbnail call in the inc/adventurous-functions.php file and pass arguments to disable lazy loading for featured images

Do you have a solution for modifying this inc/adventurous-functions.php file ?

Thanks in advance and best regards
Ulrich