Contact info has purple background after iOS 26 update!!! 😳

Yesterday I updated mi iPhone 15 Pro to iOS 26.

Now when I go into my Contacts, each of them has a different background color. Most of them are purple. Some others are green. And so on. They also changed the color for the letters. Now they are white. There is no contrast with the background! And just like that all my Contacts look too colorful, uneven and disorganized to me. I like neat orderly design. Black letters and white background in all contacts worked perfect for me. I don't really understand why Apple would mess directly with all your contact's background instead of giving you the chance to decide.

Please, let me know if there is a way to return Contacts aesthetics to the way they were before (something that does not require to do it one by one, please)... Thanks!