How to disable featured image in post WordPress twenty sixteen and fifteen theme

If you want to disable featured image in post or page you can paste the code below in ‘custom CSS code’

.single-post .attachment-post-thumbnail {
display: none;
}
.post.has-post-thumbnail {
padding-top: 4%;
}


We have checked this with WordPress Twenty Sixteen theme.

Source: https://wordpress.stackexchange.com/questions/219440/hide-featured-image-in-post-in-twenty-fifteen