Please add the code below to the Custom CSS area in Dashboard > Vamtam > General Settings > Custom CSS
Here is a guide how to add custom css: How to add custom CSS / PHP code or modify the theme code ?
1. To hide the featured image in a single blog post
Please add this code in the Custom CSS field:
body.single-post .post-article .post-media .media-inner > img { display: none; }
2. To hide the featured image in a single portfolio post
Please add this code in the Custom CSS field:
.post-article .image-post-format .post-media .post-full-thumb, .post-article .standard-post-format .post-media .post-full-thumb, .post-article .gallery-post-format .post-media, .portfolio-image-wrapper { display: none; }