How to show featured image in article?

Featured images show on the front page, but not in posts themselves. This bit from style.css seems to be responsible:

.schema-image {
    display: none;
}

Right now I force thje images to be displayed by adding custom css:

.schema-image {
    display: block !important; 
}

But is this intentional? What is the “official” way of having a featured image displayed in the post?

(Also, what is the recommended/optimal size or size ration for featured images?)

• This topic was modified 6 years ago by marek.