7 files declare their use of LayoutInterface
- ConfigureSectionForm.php in core/modules/ layout_builder/ src/ Form/ ConfigureSectionForm.php 
- EntityDisplayWithLayoutInterface.php in core/modules/ field_layout/ src/ Display/ EntityDisplayWithLayoutInterface.php 
- FieldLayoutEntityDisplayTrait.php in core/modules/ field_layout/ src/ Entity/ FieldLayoutEntityDisplayTrait.php 
- LayoutPluginManagerTest.php in core/tests/ Drupal/ Tests/ Core/ Layout/ LayoutPluginManagerTest.php 
- SectionComponentTest.php in core/modules/ layout_builder/ tests/ src/ Unit/ SectionComponentTest.php 
- SectionRenderTest.php in core/modules/ layout_builder/ tests/ src/ Unit/ SectionRenderTest.php 
- SectionTest.php in core/modules/ layout_builder/ tests/ src/ Unit/ SectionTest.php 
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