Setting up positioning
You need positioning to create free sections. It lets you fix the position of elements on the canvas.
This makes your section look the same across different devices with various viewports, for example, on 6.5 inch smartphones and 32 inch PC monitors.
To make elements stay in the same place (i.e. to have defined coordinates), you need to set up the section.
Positioning of elements in the standard sections is already set up for you. Positioning of elements in free sections depends on your choice only.