Image still shows up

Hello there,

I have a problem with your plugin. It is for following page

https://www.testly.de

Example here: https://www.testly.de/autoradio-mit-navi/

I want to remove the featured image and put also yes in the post options for that. It unfortunately still shows up. Can you help me with that?

I already followed your tasks here https://leijingwei.com/how-to-hide-featured-image-of-wordpress-theme-latest/

I really need your help. Kind regards

Christian