Creating columns out of an existing menu text box is simple and fast. First start by selecting the menu text box you like to have columns. Then, in the left-hand side bar select the Layout tab. See picture below. -
From here choose if you'd like the text box to disperse the items in two or three columns. As you select the options the text will automatically adjust on the design. You can also choose the spacing between the columns here as well.
Here is a video walkthrough -