6 files declare their use of LayoutEntityDisplayInterface

DefaultsEntityForm.php in core/modules/layout_builder/src/Form/DefaultsEntityForm.php
DefaultsSectionStorageTest.php in core/modules/layout_builder/tests/src/Unit/DefaultsSectionStorageTest.php
LayoutBuilderEntityViewDisplayForm.php in core/modules/layout_builder/src/Form/LayoutBuilderEntityViewDisplayForm.php
LayoutEntityDisplayNormalizer.php in core/modules/layout_builder/src/Normalizer/LayoutEntityDisplayNormalizer.php
LayoutEntityHelperTrait.php in core/modules/layout_builder/src/LayoutEntityHelperTrait.php
layout_builder.post_update.php in core/modules/layout_builder/layout_builder.post_update.php
Post update functions for Layout Builder.

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