A category page must have at least one product with name, image, price greater than 0. When you enable the quick navigation for the category pages, the image for the first product in a category page will be set the category image. Since you haven't uploaded the images for any of the products in your form, it is displaying the default placeholder image for each category. You just have to upload an image for the first product in each category. Please try this and confirm.

The reply-to email address for the form respondents can either be the email account you used to setup the email notifications or the email address you have entered in the Email collaborators setup. Please share the link for your form so that we can check the setup and confirm.

Hi - The theme colors are applied to the entire form, including the banner. Colorful vs Minimal theme. You can either choose the Colorful or Minimal theme and customize the colors, fonts. In the Colorful theme, the banner image will be set as a cover image that will be displayed at the top. Users will have to click on the start button to view the form. The recommended size for this is 1280px X 720px. The banner image has an overlay depending on the primary, secondary color. The color for the header displayed on scroll will be set automatically based on the primary color selected for this theme. Please note that the logo is displayed only in the footer in the Colorful theme. In the Minimal theme, the banner image will be displayed above the form title. Users will directly see the form when they open the link. The recommended size is 800px X 300px. You can set the primary color that will be used for the button and select the preferred background color for the page.