Layout Builder - Drupal 9

Drupal's Layout Builder allows content editors and site builders to create grid layouts for displaying content. Users can customize how content is arranged on a single page, across types of content, or even create custom landing pages with a drag-and-drop interface. Layout Builder is turned on by default for Basic pages on SCLS-supported library websites.

The Layout Builder provides the ability to drag and drop site-wide blocks and content fields into regions within a given layout. Additionally, custom "inline" blocks can be created for one-off details specific to a given layout.

Additional Layout Builder documentation on Drupal.org: Layout Builder