In this article, we will show how to create left-to-right placement of form elements when collapsing into a single column (under screen width constraint).
Figure 1: Width of more than 900px (top), and less than 900px (bottom)
Add this CSS code into a Custom HTML element.
...
Edit the column of this section to "Horizontal Layout"
Figure 2: Column Properties as Horizontal Layout
When the screen width is more than 900px, fields will be displayed in 2 columns layout and when it is less than that, it will become a 1-column layout with field placement following left-to-right placement into single column.
...