In Excel 365 I inserted some new rows and this format symbol appeared.

https://dl.dropboxusercontent.com/u/...-Pasting-1.jpg

What exactly should I have done with it? What I actually did was to
click 'Format same as above'. Nothing obvious happened. In particular,
the symbol did not go away. How do I remove it, as it's rather
distracting?

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Terry, East Grinstead, UK