Page header image will display at Frontpage, inner pages below the header content.
To set Page header, Go to Appearance > Header > Page header.
Here upload your page header image and Enable Page Header.
You can also set the Overlay color, Go to Appearance > Color & Background > Page header color
Note – This setting will not work for Archive pages, shop page. If you want to set Page header for these pages. Go to Pages > Shop Page > Upload Featured images and publish it.
If you want to show different image for each page you can upload it from Pages > Your Page > Upload Featured image.