I'm using a featured image so that my post gets that image when it is posted to social media. The problem is that the a slice of the image appears in the header of the post, like this (featured image slice is in the red rectangle):
I have read some advice saying that I should not place both have the image as featured and put it into the post itself. However, removing the image from the post only does just that - removing it from the post but keeping it in the header, which is the reverse of what I want.
So how do I get rid of it from the header?