Github user PetroKostyuk commented on the issue:
https://github.com/apache/zeppelin/pull/1748
I tought it wold be enought to give it same icon as is used for clearing
output in other places. Also, there is tooltip 'clear notes output' on that
button, as I have seen in other places in Zeppelin. Sorry i didn't put
screenshot of tooltip, i couldn't hover mouse on it same time as selecting area
of screenshoot by mouse. But if you have some other idea how to make it clear,
I'm opened for suggestions.
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