I want to make the background of rows to have a full screen width. Like e.g. this site:
Hi. On pages created as SP PB Page, it works as default. If it does not work in your template, you will most likely need additional CSS coding for your template. How for example it is required for Protostar.
If you are talking about the Joomla article edited via SP PB (in Helix based template), it will also require additional coding CSS.
Here is some code snippets for this
https://archive.joomshaper.com/forums/joomla-article-integration-full-width
Options row -> Fluid Row not a solution as it makes fluid container inside the section, but not makes full widtn section itself