Question: Worksheet mode borders

Hi

How do I disable the black borders around each command line in worksheet mode? I've seen it at several occasions, but I don't know how to do it :)

I think it would make my worksheets look much better, especially when exporting them to PDF.

 

If you are unsure about what I meant, the black borders can be seen here: https://image.prntscr.com/image/Foc_EYldSXiqb9T_8wLuYA.png

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