Ah. In the screenshot you've shared, that actually pertains to whether or not you want a custom footer on your site. Unfortunately, you cannot remove the product footer as it is required by data privacy laws. https://doc.arcgis.com/en/hub/sites/configure-consent-notice-and-product-footer.htm#ESRI_SECTION1_36...
@KlaraSchmitt Ok. Thanks for confirming that. I might try to go into the settings/footer/css area to get the footer colour to match the backgrounds of what I've embedded into the pages.
Is this the best place to do it for the site or do I need to do it page by page?