Responsive Grids with Columns
Here is a column group of 6. With custom CSS (under Row settings) the width of each is set to 33.33% on desktops and has created a grid of 2 x 3.
Without custom CSS we could have created 2 column groups of 3, but if we change the responsive settings we can end up with empty areas.
For example if we set to 50% we would get 2 on top and one below twice creating two empty spaces.
This is using .fl-col to set the widths of all columns in this row including this one.