After the latest batch of updates (11.10), Thunderbird was updated too. However, as can be seen in the screenshot, Thunderbird now defaults the Quick Filter Bar to icons-plus-words which also breaks the layout (look at the search bar to the right).
When I click on View, to uncheck and re-check the Quick Filter Bar option, it reverts to just icons, as originally expected. However, if I shut down down Thunderbird and launch it, the icons-plus-words appear and I have to go through the same process again.
How do I fix this?