The following KB articles relate to this topic:

Custom Row Layout

You can use layout blocks to manage a variety of content on your webpage. Layout Blocks are good for aligning content and efficiently using up window space. The rule of thumb with layout blocks is that the widths of the columns, when added together, must equal 12 units. Therefore, with a custom row layout block, you could have any number of columns - as long as the width of the columns adds up to 12.

Unlike with 2, 3 and 4 column layout blocks, the custom row layout block allows you flexibility right from the start. If you know exactly how many columns you want and what their widths should be, you can set all of that information right away. The other advantage is that the custom row layout will allow you to build out more than 4 columns (technically up to 12).

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Custom Row Layout Examples