[Theme Boutique] Menu columns

Hi

i am using this theme Boutique from woothemes and i want to adjust the menu column to be 2 instead of one as my menu items are way too much to handle in 1 column

i added an image just to make it more clear .

please help.

in case you need to check the site , the site is https://www.vartgifts.com

here is the image of the menu :

https://najddergham.com/saa.jpg