Layout Builder gave Drupal site builders real control over page structure, and then stopped one level short. A section is where the layout decisions live, but a section could not have fields of its own, so anything a builder wanted to vary per section — a background treatment, an anchor ID, a heading that belongs to the section rather than to a block inside it — had to be solved somewhere else. Usually in a theme, by a developer, which is the opposite of the point.
Layout Section Fields closes that gap. It gives site builders a configuration form for defining fields on sections. Those fields then appear on the configuration form of every new section and render inside it, without a developer in the loop.
Philip Frilling, lead back-end engineer, published it to Drupal.org in May 2022. Drupal.org credits Oomph (now Pare & Co) with the architecture and development.
Via Drupal.org.