How to switch back to yahoo mail classic?

I just switched over to the new yahoo mail(the green one) and I want to switch back to classic, but it's not letting me. How do I switch back to yahoo mail classic(purple one). also when I scroll over the email in this new one it's not letting me get a preview of the message, how do I do this. Please... show more I just switched over to the new yahoo mail(the green one) and I want to switch back to classic, but it's not letting me. How do I switch back to yahoo mail classic(purple one). also when I scroll over the email in this new one it's not letting me get a preview of the message, how do I do this.

Please explain in detail, thanks.
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