Michele,
I am actually not sure where that dark red is coming from. It must be that your theme has some design for WC Vendors; perhaps you could ask if they have in idea for how you could change that or get rid of that for your admin products.
I’d think some code that excludes the vendor banner from the product page for admin would do it- but I am not sure how your theme has the banner area designed or altered, so I am not certain exactly how it would need to be written.