.pageformat {columns} applies a multi-column layout to each page, given that the value of columns is higher than 1.

.pageformat columns:{2}

[!CAUTION] Multi-layout column is yet unstable in paged documents and is inconsistent across browsers (specially Safari).
If you know how to improve the result via Paged.js, please open a PR.

Span property

When in a multi-column layout all elements, except for level 1-3 headings, are rendered within their own column.
It's possible to set some content to instead span across all columns of the layout by using the .fullspan block function.

...

.fullspan
  ![](img.png)

...

To do: example