OK found it in an answer elsewhere. It's the X key. Apparently I set some filter.
Shouldn't there be some visual cue of a set filter?
Other question: is there a way to get to the Search panel other than with the F key?
The fact that clicking the "<" button in the Search panel gets me to the More panel suggests that there should be a "Search" option in there, but there isn't.
Congratulations to @Laura Holton , our latest winner of Taco Tuesday! And thanks to @Kristjan Geir Mathiesen - Origo for sharing the picture of Taco having fun with his new friend...
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