How do I get rid of the black search bar at the top of Thunderbird Supernova 115.4.1?

I have dragged the Ctrl-K search bar that sits right at the top of Thunderbird with “Customize” and made it disappear from there. But I still have that back bar with the right arrow and the hamburger sign at the top, as shown here:

How can I make that wasted space disappear?

https://support.mozilla.org/en-US/questions/1425289

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