The save rows feature allows you to select a rowrow - Rows are structural units that define the horizontal composition of a section of the message by using columns. in a message and save it for later use. Any saved row can be dragged into other messages across any campaign that contains an email channel message.
Look for the save icon that appears when a row is selected:
Clicking this icon will display a save dialogue from which you can then enter a name for your row and click Save. Once a row has been saved is can be found in the Rows tab under the Saved menu.
The same save action is also available in the row properties panel when a row is selected:
Updated 3 months ago