Why MariMekko Chart shows value as percentage within brackets misleading to assume it is negative

Hi , We bought Marimekko chart, wanted to display the  data labels width value in percentage, it is showing with in (), which misleads business to assume we are in negative.

How to remove this () when it is displayed as percentage?

ex: 76.8 % is displayed as (76.8%)

Thanks,

Vimala