New Email Format has Hijacked my branding

Where do you get off hijacking my email format to customers with your branding? This is completely unethical and is ripe for civil legal action against you. You have no right whatsoever to overwrite another company's branding. How do I get this thing reformatted back to my template? We use Enterprise Desktop 2024, and I cannot find how to customize email template anymore as they are not in Template under Lists anymore. Do not give me the stupid Send Forms instructions either as that is only content. I WANT TO REFORMAT THIS ENTIRE EMAIL!