Hi prethon. I already answered that question in your other post here:
https://ww.wp.xz.cn/support/topic/post-complete
To hide the image you could add this to a child theme style.css file or a plugin like Simple CSS or Simple Custom CSS:
.post-thumbnail {
display: none;
}
this post is complete on the page, completing where had the thumbnail ?
Look at the site please delete the thumbnail , but the post did not complete the page
http://huezoero.com.br/
The code I posted above will hide the post featured image. Your images are part of your post content. If you want to hide the content images use this:
.post .entry.excerpt img {
display: none;
}