Updated editor layout support in 6.1 after refactor

WordPress 6.1 brings considerable more flexibility to the layout controls and features to the block editor. A new layout type, “constrained”, was added to the already available Flow and Flex layouts types. In addition, layout refactor efforts bring new layout styles, new block level spacing, more semantic class name for layouts, root padding and a method to disable all layout styles all together for themes. New “constrained” layout type The new “constrained” layout type has been split out from the “flow” layout. This means that the “flow” now corresponds only to the base layout configuration. This change moves the

source https://www.worldofwp.com/updated-editor-layout-support-in-6-1-after-refactor/