Configuring
You need display_builder_ui.
Permissions:
- "Administer display builder"
List of Display builder profiles
/admin/structure/display-builder

Configuration of a single Display builder profile (config entity)
Each Display builder profile is a configuration entity with:
- Metadata: a label and a description
- The islands configuration, by type
There are 5 type of islands:
Viewpanels: They are displayed tabbed in the center of the toolbar, or as buttons in the start of the toolbarButtons: they a re displayed as buttons in the end of the toolbarLibrarypanels: They are displayed tabbed into the Library View panelMenuitems: they are displayed in the contextual menu triggered with right-clickContextualpanels: They are displayed tabbed into the contextual sidebar
Visual positioning:

Each island can be:
- enabled or not
- ordered relatively to the other ones of a same type
- configured one by one
For example, here is the configuration of Toolbar buttons, where some are configurable:

Configuration happens in a modal:

View panels have an extra feature, they can be moved between 2 different regions:
- tabbed in the center of the toolbar
- or as buttons in the start of the toolbar

🚧 2025-11-05: This mechanism may be made generic. See #3555920
Access & permissions
Each Display builder profile is associated to a permission:

This is conditioning the builders available in the selector for a specific user:
