As you can see in the images of the first pop-up menu on this page regarding the Scale, there are more options to set locally. One of them is Display as Rows. The default layout of page with a Step Group (more than one step on a page) is Display as Columns. Sometimes it is better to layout the page as Rows. To do so you right-click on one of the Assemblies in the Step Group and choose the Display as Rows option.
You can also apply this to a Callout. This works the same, only then you right-click an Assembly that is part of the Callout and choose from the menu.
Once you have applied to Display as Rows and wish to change to Columns again not the option in the menu has changed to Display as Columns.