Menu - display submenu in 2 columns

Hello Balbooa,
The main menu on a website, contains a submenu with 25 items. I've created a second menu module for the main menu, which only contains items for this submenu (level 2). I've added the GB menu plugin to a page and associated it to this second menu module.

The GB plugin correctly shows just the items within the submenu. However, I want the GB menu plugin to show the menu items in 2 colums, so it takes up less vertical space.

Is there a way to display a menu as two columns on a page, configured either through the GB plugin or the menu module?

Many thanks for your help,
Marc

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