Please scroll to bottom and click "Try this" to see preview of builder setting.
How to create sections ?
Section General Setting

Background Color
Background Gradient
Background Image
Section Columns Config

For each section, you can divide it into multiple columns, and for each column you can set different views on the desktop, tablet, mobile.
Desktop: 12 | Tablet: 12 | Mobile: 12
Desktop: 6 | Tablet: 6 | Mobile: 12
Desktop: 6 | Tablet: 6 | Mobile: 12
Desktop: 4 | Tablet: 4 | Mobile: 12
Desktop: 4 | Tablet: 4 | Mobile: 12
Desktop: 4 | Tablet: 4 | Mobile: 12
Desktop: 3 | Tablet: 6
Desktop: 3 | Tablet: 6
Desktop: 3 | Tablet: 6
Desktop: 3 | Tablet: 6