Textual words from them:

It’s our first step towards a more modern, more beautiful, and more customizable Thunderbird experience. We think you’re going to love it, and we are endlessly grateful for all of your support throughout the years 💙

    • Leviathan@feddit.ch
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      1 year ago

      I guess I must have always had it collapsed. In the new Outlook, they removed the option to remove or collapse it.