The mega menu below has three columns of links but you'd prefer only 1 or 2 columns.
Remove the Row Containing Three Columns
1. Select one of the Link List modules.
2. Click to open the layer menu.
3. Select the first row above the Link List layer.
4. Click the trashcan icon to delete the row.
You now have just column. If you wish to have two columns, skip the next step.
Add a Link List Module (Single Column Option)
Hover to reveal the plus sign for adding modules. Click to insert a new link list module.
Your mega menu should now look like the screen shot below (one link added for clarity).
Add a Two Column Layout
As pictured above, hover over the Mega Menu to reveal the plus sign for adding modules. Choose the Layout tab in the insert module popup and choose the 50-50 option.
You now have two columns in which to add Link List modules.
Adjust the Width of the Dropdown Menu
Select the Mega Menu as pictured below, then use the Dropdown Width menu on the toolbar to select an appropriate width.
You're all done! Be sure to save your work.