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There is a great feature in the code block:
There is a button at the top right corner of the code block to let me quickly copy the whole codes. That is a handy feature at most scenarios.
But there isn’t a button in the callout block:
I think the callout deserves a copy button at the same corner, too. Just like the red icons I painted in the image I posted.
There is no workaround now, I can only copy the content by selecting them and copy with context menu or keyboard shortcuts.