Thanks for your question. In the case of header images on every page, there is no any options to remove it. This theme is designed in the such way that if featured image is not set, default image will display and the page title is displayed above the header image. If you hide that section, the page title will also hide. So, we recommend you to use the header image for each page.
If you really want to remove it, you have to do some custom CSS work for it. Please add this below CSS on your child theme style.css file.
Hope, this code will help you to solve your issues.