How do I make a section stretch edge to edge across the screen?

Open the section and go to the Layout tab. Then change Element Width:

• Container: a centred column with space on both sides.
• Container Fluid: the background runs full width while the content keeps a small margin at the sides.
• Full Width: truly edge to edge, with no side padding.
• Custom… (on some sections): type a Custom Width and choose a Unit (px, %, vw or rem).

If the section is narrower than the screen, Section Position on the Style tab sets whether it sits Left, Center or Right.

You can choose a different width for phones on the Mobile device tab. Click Save when done.