I did not want to try it, you forced me to -- call bs on "Thanks for trying our new..."
Stop forcing people to try your supposed improved email experience by not letting people get past the option to try it, you are left with no choice but to click on it and then no options to cancel the switch. Yahoo experience goes further downhill every day.

If you’re having trouble with New Mail, try these browser troubleshooting steps to fix the issues: https://forums.yahoo.net/t5/Tips-and-tricks/Yahoo-Mail-doesn-t-work-or-runs-slow/td-p/441893/jump-to/first-unread-message
Thank you!
Mail Support
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Sylithnae Kennry undlin commented
Today, was the day I was forced to use the new mail. I don't like it. Feels clunky to me. It's slower... so sloooowwwwwww. First yahoo did away with the independent chat program and now this. I am thinking on changing my e-mail account to elsewhere as well now. Sad as I've had this one for years.
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Bob Domino commented
The spam and trash folders don't display how many new message are in there like the old one. Put that feature back.
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john commented
NEW MAIL SUCKS TAKES FOREVER TO LOAD . I HATE IT
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T Jensen commented
New mail is glaringly bright and ******* the eyes. One needs sunglasses to view the damned thing.
Having this joke of a mail service forced down one's throat is ridiculous. SHAME on Yahoo for this mess.