First mouse over an area of the stage that is free of message content.
Then, click to select it.
The right side of the editor will now show you some properties. They will apply to the entire row (e.g. background color, background image, padding, etc.).
Now you can also:
- Do not stack on mobile the content of the row
- Reverse stack the order of the row
- Add and customize the column settings
This also includes some settings that apply to each column in the row. A row could contain up to 6 columns, and you can control several settings for each column.