On the left hand side of the editor, you will find different elements categorized in tabs, such as the Structures tab. You can set up the format of your message under this tab.
Click on Structures to see the following options:
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Rows: Rows can consist of multiple columns and are used to structure an article block. Elements are placed in a row, such as text and image(s). A row is always placed in a section.
- Sections: a section is a part of the message which consists of row(s). If you want to create (visually) different article blocks, you give each block its own section.