Same thing happened to the guy with the Ghostbusters license plate

https://www.nbcnewyork.com/news/ghostbusters-inspired-license-plate-gives-ny-man-toll-headache/5503912/

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Sounds like that’s in here:

“The test build shows the horizontal tab bar and the sidebar at the same time by default. A click on the new “hide tab strip” button hides the horizontal tab bar so that only the vertical sidebar remains.”