diff --git a/core/modules/layout_builder/src/Plugin/SectionStorage/OverridesSectionStorage.php b/core/modules/layout_builder/src/Plugin/SectionStorage/OverridesSectionStorage.php
index ef154f1b2b2..db38b1203e5 100644
--- a/core/modules/layout_builder/src/Plugin/SectionStorage/OverridesSectionStorage.php
+++ b/core/modules/layout_builder/src/Plugin/SectionStorage/OverridesSectionStorage.php
@@ -187,7 +187,9 @@ class OverridesSectionStorage extends SectionStorageBase implements ContainerFac
    * {@inheritdoc}
    */
   public function getDefaultSectionStorage() {
-    return LayoutBuilderEntityViewDisplay::collectRenderDisplay($this->getEntity(), 'default');
+    // @todo Expand to work for all view modes in
+    //   https://www.drupal.org/node/2907413.
+    return LayoutBuilderEntityViewDisplay::collectRenderDisplay($this->getEntity(), 'full');
   }
 
   /**
diff --git a/core/modules/layout_builder/tests/src/Functional/LayoutBuilderTest.php b/core/modules/layout_builder/tests/src/Functional/LayoutBuilderTest.php
index 4dc9a85d0db..a78e9eeeb79 100644
--- a/core/modules/layout_builder/tests/src/Functional/LayoutBuilderTest.php
+++ b/core/modules/layout_builder/tests/src/Functional/LayoutBuilderTest.php
@@ -256,4 +256,67 @@ class LayoutBuilderTest extends BrowserTestBase {
     $assert_session->elementNotExists('css', '.block.menu--mymenu');
   }
 
+  /**
+   * Tests the interaction between full and default view modes.
+   *
+   * @see \Drupal\layout_builder\Plugin\SectionStorage\OverridesSectionStorage::getDefaultSectionStorage()
+   */
+  public function testLayoutBuilderUiFullViewMode() {
+    $assert_session = $this->assertSession();
+    $page = $this->getSession()->getPage();
+
+    $this->drupalLogin($this->drupalCreateUser([
+      'configure any layout',
+      'administer node display',
+      'administer node fields',
+    ]));
+
+    $field_ui_prefix = 'admin/structure/types/manage/bundle_with_section_field';
+    // Allow overrides for the layout.
+    $this->drupalPostForm("$field_ui_prefix/display/default", ['layout[allow_custom]' => TRUE], 'Save');
+
+    // Customize the default view mode.
+    $this->drupalGet("$field_ui_prefix/display-layout/default");
+    $this->clickLink('Add Block');
+    $this->clickLink('Powered by Drupal');
+    $page->fillField('settings[label]', 'This is the default view mode');
+    $page->checkField('settings[label_display]');
+    $page->pressButton('Add Block');
+    $assert_session->pageTextContains('This is the default view mode');
+    $this->clickLink('Save Layout');
+
+    // The default view mode is used for both the node display and layout UI.
+    $this->drupalGet('node/1');
+    $assert_session->pageTextContains('This is the default view mode');
+    $this->drupalGet('node/1/layout');
+    $assert_session->pageTextContains('This is the default view mode');
+    $this->clickLink('Cancel Layout');
+
+    // Enable the full view mode and customize it.
+    $this->drupalPostForm("$field_ui_prefix/display/default", ['display_modes_custom[full]' => TRUE], 'Save');
+    $this->drupalGet("$field_ui_prefix/display-layout/full");
+    $this->clickLink('Add Block');
+    $this->clickLink('Powered by Drupal');
+    $page->fillField('settings[label]', 'This is the full view mode');
+    $page->checkField('settings[label_display]');
+    $page->pressButton('Add Block');
+    $assert_session->pageTextContains('This is the full view mode');
+    $this->clickLink('Save Layout');
+
+    // The full view mode is now used for both the node display and layout UI.
+    $this->drupalGet('node/1');
+    $assert_session->pageTextContains('This is the full view mode');
+    $this->drupalGet('node/1/layout');
+    $assert_session->pageTextContains('This is the full view mode');
+    $this->clickLink('Cancel Layout');
+
+    // Disable the full view mode, the default should be used again.
+    $this->drupalPostForm("$field_ui_prefix/display/default", ['display_modes_custom[full]' => FALSE], 'Save');
+    $this->drupalGet('node/1');
+    $assert_session->pageTextContains('This is the default view mode');
+    $this->drupalGet('node/1/layout');
+    $assert_session->pageTextContains('This is the default view mode');
+    $this->clickLink('Cancel Layout');
+  }
+
 }