web authentication button during checkout

-- url of the page with the problem -- : dutch.audio/nl/dutch-audio-webshop/checkout
-- HikaShop version -- : 4.7.0

Since quite recent a new button during checkout is introduced, the web authentication button. This is really confusing and troublesome for a lot of customers and the button is really prominent and I can't make it smaller or hide it.
How does that work? I can't seem to find anything about it.

That did the job indeed! Thanks a lot Saves me some mails from clients complaining they can't login.