The Group block serves as WordPress’s primary layout container, providing access to all major layout tools through a single, versatile block. By default, it uses flow layout, but you can enable constraint mode or switch to flexbox (row/stack) and grid layouts.
All layout variations (Group, Row, Stack, Grid) are the same underlying block with different layout modes. You can switch freely between layout types without changing blocks, providing incredible flexibility during design iteration.
Each layout variation appears separately in the block inserter for convenience, and you can use type shortcuts (typing “row” brings up the row layout directly). This design makes layout building both intuitive and powerful.
Understanding that one block provides all layout capabilities simplifies the WordPress layout system – you’re learning one tool with multiple modes rather than separate, unrelated blocks.