Set the size of a button to zero in blocks editor(new UI)

Hi

I am trying to set the size of a button and a label to zero using the blocks editor.
I keep seeing people refer to setting the row height to 0 but I am using the drag and drop UI there is no row option.

Can anyone give me a clue how iI can do this?

Thanks
J

I already reqeusted this here.

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Thanks