I have featured images set on pages but they do not show up, and I do not see them hidden in the html code anywhere either. I do not understand what is going on, is it a setting somewhere or what exactly is doing this ?
You can look at contact page to see -> https://retetecugust.com/formular-de-contact/. And also at the about page which is on the right sidebar in the page I mentioned above. The thumbnails are seen but when you enter the page there is no display of the image.