trick

I bought the theme. Please tell me how to enable this on all post https://community.mythemeshop.com/topic/65282-feature-image/

is it possible to make it a normal size feature image ?

I like this theme but from demo it doesn't seem to have feature image on single post. Is there a setting to enable feature image in single post ? Feature image on single post is the most important feature for me but it seems almost all your new themes doesn't have this as default?