Page Header Image

The Image section of the Page Header meta box allows you to upload a custom image, or set your featured image.
In most cases, you should use the Featured Image instead of uploading a custom image.
The custom image can be useful if you already have a featured image in use, and want a different image for your page header.
Page Header Image
Once you have a custom or featured image set, you』ll see options available to link the image and resize it.
Page Header Image – More Options