Background images on row and columns
Any row or column can have a background image. The image can be a fixed background added in the row options, Journal > Layouts > Home... locate the row which has (or will get) the image and edit row options. The row options are accessed via the small pencil button seen when hovering over the row. In the row options popup, you have options to add a row background image in the Background section.
See row docs to learn more: https://docs.journal-theme.com/docs/layouts/rows/
Also, see the background option docs to learn more: https://docs.journal-theme.com/docs/options/background