Layout controls enable per-block content width and wide width settings, allowing blocks to inherit theme defaults or use custom dimensions. Currently requires experimental__layout in the supports section due to API instability.
Experimental APIs are prefixed with underscores and “experimental” to indicate they may change without notice. Once stable, the prefix is removed and deprecation procedures protect existing implementations.
Use experimental features cautiously and stay updated with Gutenberg development. Apply box-sizing: border-box to ensure proper alignment with core blocks that use this CSS model.