Are you refer to this change? The border around the text is not enlarged, but the amount of space within it is very slightly wider, which could change word wrapping and make some notes taller, but not wider.
Do read the whole thread carefully though, for tips on how to work with it. You will note for instance that this should not happen out of the blue, but mainly if you copy and paste or drag and drop from older boards. There is also a tip for changing the padding within notes.