Internals
Entity displays
Display Builder data is stored as a third party settings with those properties:
profile: the Display builder profile (config entity) in use last time the config was savedsources: a UI Patterns 2 sources tree
Example:
id: node.article.default
targetEntityType: node
bundle: article
mode: default
content: {}
hidden: {}
third_party_settings:
display_builder:
profile: default
sources: [...]
Overview:

Entity display overrides
Display Builder data is stored as content field provided by ui_patterns_field module, where every field item has those properties:
node_id: The ID of the node in the source treesource_id: the source plugin IDsource: the source plugin configthird_party_settings: extra configuration, prefixed by module or island plugin ID
The entity view display config entity has additional override_field and override_profile properties for the field name storing the data and the related display builder profile:
id: node.article.default
targetEntityType: node
bundle: article
mode: default
content: {}
hidden: {}
third_party_settings:
display_builder:
profile: default
sources: [...]
override_field: field_full_display
override_profile: default
Overview:

Page Layouts
Each page is its own config entity
profile: the Display builder profile (config entity) in use last time the config was savedsources: a UI Patterns 2 sources tree
Example:
id: users
label: Users
weight: -9
profile: default
sources: [...]
conditions:
request_path:
id: request_path
pages: /user/1
negate: '0'
Overview:

Views
Display Builder is a display_extender plugin with those properties:
profile: the Display builder profile (config entity) in use last time the config was savedsources: a UI Patterns 2 sources tree
Example:
id: articles
label: Articles
module: views
display:
page_1:
id: page_1
display_title: Page
display_plugin: page
position: 1
display_options:
title: Articles
path: articles
pager: {}
exposed_form: {}
empty: {}
style: {}
header: {}
footer: {}
display_extenders:
display_builder:
profile: default
sources: [...]
Overview:
