How-to
How do I add, move and style sections?
In short
Add a ready-made section, move it up or down, and change its look from the Style panel on the right.

Open your page in the editor and click Add a section.
Pick a design. It is added to your page.
Click the section's name under Page sections to select it.
Click Move up or Move down to change its place.
Open Style on the right and choose a background.
Click Save draft.
Good to know
The row under Page sections also has Duplicate and Delete.
Content holds the words and pictures. Layout and Style change spacing, colours and corners.
The small buttons at the top of the editor switch the preview between phone, tablet and computer widths.