Field Usage Display

The problem

Drupal fields are reusable within the same entity type. The same field storage (for example, body) can be attached to multiple bundles — for example, the Article and Basic page content types can both share the same body field storage. Before modifying or deleting a field, an administrator needs to know where else it is used.

The existing global field report at /admin/reports/fields provides this information, but only as a site-wide table that must be scanned manually and is disconnected from the page where field decisions are made.

The solution

Field Usage Display adds a single "Also used in" column directly to the Manage Fields table — right where administrators are already working. The column is blank for fields used only in the current bundle (no noise), and lists the human-readable labels of other bundles for shared fields (immediate context before editing or deleting).

Example (Article content type)

Features

• Works on all fieldable entity types: content types, media types, taxonomy vocabularies, block types, user accounts, and any other entity type that uses Field UI. Within each entity type, all bundles sharing a field storage are listed.
• Displays human-readable bundle labels, not machine names.
• Optional integration with ctools_entity_mask: when that submodule is installed, cross-entity-type borrowed fields are also listed, with the entity type name shown in parentheses for clarity.
• No configuration required — the column appears automatically.
• No new pages, routes, or permissions — purely additive to existing UI.

Requirements

• Drupal 11
• Core modules: field, field_ui (both enabled by default on most sites)