Collapsible Groups in Block Editors
Long block forms are now split into collapsible sections, one open at a time, so editing a busy block means less scrolling and less hunting.
Website Builder blocks can carry a lot of settings: content, layout, appearance, spacing, and behaviour can add up to dozens of fields on one screen. Block editors in the Website Builder now organise those fields into collapsible groups, styled to match the inspector in the Screens builder. Opening one group closes the others, so the form stays the height of the section you are working in rather than the sum of all of them.
Where you will see it
Any block that groups its fields picks this up automatically. Field names, defaults, and saved values are unchanged; only the presentation differs, so existing pages carry on as before.