diff --git a/core/modules/field_layout/field_layout.install b/core/modules/field_layout/field_layout.install
index 5956bf1095..18875181c9 100644
--- a/core/modules/field_layout/field_layout.install
+++ b/core/modules/field_layout/field_layout.install
@@ -40,3 +40,19 @@ function field_layout_uninstall() {
   // Invalidate the render cache since all content will no longer have a layout.
   Cache::invalidateTags(['rendered']);
 }
+
+/**
+ * Implements hook_requirements().
+ */
+function field_layout_requirements($phase) {
+  $requirements = [];
+  if ($phase === 'install') {
+    if (\Drupal::moduleHandler()->moduleExists('layout_builder')) {
+      $requirements['field_layout'] = [
+        'description' => t('Field Layout cannot be installed because the Layout Builder module is installed and incompatible.'),
+        'severity' => REQUIREMENT_ERROR,
+      ];
+    }
+  }
+  return $requirements;
+}
diff --git a/core/modules/layout_builder/layout_builder.install b/core/modules/layout_builder/layout_builder.install
new file mode 100644
index 0000000000..64b64078eb
--- /dev/null
+++ b/core/modules/layout_builder/layout_builder.install
@@ -0,0 +1,22 @@
+<?php
+
+/**
+ * @file
+ * Contains install and update functions for Layout Builder.
+ */
+
+/**
+ * Implements hook_requirements().
+ */
+function layout_builder_requirements($phase) {
+  $requirements = [];
+  if ($phase === 'install') {
+    if (\Drupal::moduleHandler()->moduleExists('field_layout')) {
+      $requirements['layout_builder'] = [
+        'description' => t('Layout Builder cannot be installed because the Field Layout module is installed and incompatible.'),
+        'severity' => REQUIREMENT_ERROR,
+      ];
+    }
+  }
+  return $requirements;
+}
diff --git a/core/modules/layout_builder/layout_builder.services.yml b/core/modules/layout_builder/layout_builder.services.yml
index 575dbc75ad..518d9ee942 100644
--- a/core/modules/layout_builder/layout_builder.services.yml
+++ b/core/modules/layout_builder/layout_builder.services.yml
@@ -23,3 +23,8 @@ services:
     arguments: ['@entity.manager', '@layout_builder.tempstore_repository']
     tags:
       - { name: paramconverter, priority: 10 }
+  cache_context.layout_builder_is_active:
+    class: Drupal\layout_builder\Cache\LayoutBuilderIsActiveCacheContext
+    arguments: ['@current_route_match']
+    tags:
+      - { name: cache.context}
diff --git a/core/modules/layout_builder/src/Cache/LayoutBuilderIsActiveCacheContext.php b/core/modules/layout_builder/src/Cache/LayoutBuilderIsActiveCacheContext.php
new file mode 100644
index 0000000000..c632f4b33a
--- /dev/null
+++ b/core/modules/layout_builder/src/Cache/LayoutBuilderIsActiveCacheContext.php
@@ -0,0 +1,87 @@
+<?php
+
+namespace Drupal\layout_builder\Cache;
+
+use Drupal\Core\Cache\CacheableMetadata;
+use Drupal\Core\Cache\Context\CalculatedCacheContextInterface;
+use Drupal\Core\Entity\Entity\EntityViewDisplay;
+use Drupal\Core\Routing\RouteMatchInterface;
+
+/**
+ * Determines whether Layout Builder is active for a given entity type or not.
+ *
+ * Cache context ID: 'layout_builder_is_active:%entity_type_id', e.g.
+ * 'layout_builder_is_active:node' (to vary by whether the Node entity type has
+ * Layout Builder enabled).
+ */
+class LayoutBuilderIsActiveCacheContext implements CalculatedCacheContextInterface {
+
+  /**
+   * The current route match.
+   *
+   * @var \Drupal\Core\Routing\RouteMatchInterface
+   */
+  protected $routeMatch;
+
+  /**
+   * LayoutBuilderCacheContext constructor.
+   *
+   * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
+   *   The current route match.
+   */
+  public function __construct(RouteMatchInterface $route_match) {
+    $this->routeMatch = $route_match;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getLabel() {
+    return t('Layout Builder');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getContext($entity_type_id = NULL) {
+    if (!$entity_type_id) {
+      throw new \LogicException('Missing entity type ID');
+    }
+
+    $display = $this->getDisplay($entity_type_id);
+    return ($display && $display->getThirdPartySetting('layout_builder', 'allow_custom', FALSE)) ? '1' : '0';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getCacheableMetadata($entity_type_id = NULL) {
+    if (!$entity_type_id) {
+      throw new \LogicException('Missing entity type ID');
+    }
+
+    $cacheable_metadata = new CacheableMetadata();
+    if ($display = $this->getDisplay($entity_type_id)) {
+      $cacheable_metadata->addCacheableDependency($display);
+    }
+    return $cacheable_metadata;
+  }
+
+  /**
+   * Returns the entity view display for a given entity type and view mode.
+   *
+   * @param string $entity_type_id
+   *   The entity type ID.
+   * @param string $view_mode
+   *   (optional) The view mode that should be used to render the entity.
+   *
+   * @return \Drupal\Core\Entity\Display\EntityViewDisplayInterface|null
+   *   The entity view display, if it exists.
+   */
+  protected function getDisplay($entity_type_id, $view_mode = 'full') {
+    if ($entity = $this->routeMatch->getParameter($entity_type_id)) {
+      return EntityViewDisplay::collectRenderDisplay($entity, $view_mode);
+    }
+  }
+
+}
diff --git a/core/modules/layout_builder/src/Plugin/Derivative/LayoutBuilderLocalTaskDeriver.php b/core/modules/layout_builder/src/Plugin/Derivative/LayoutBuilderLocalTaskDeriver.php
index 02a1ea14df..7054dd3605 100644
--- a/core/modules/layout_builder/src/Plugin/Derivative/LayoutBuilderLocalTaskDeriver.php
+++ b/core/modules/layout_builder/src/Plugin/Derivative/LayoutBuilderLocalTaskDeriver.php
@@ -57,6 +57,7 @@ public function getDerivativeDefinitions($base_plugin_definition) {
         'base_route' => "entity.$entity_type_id.canonical",
         'entity_type_id' => $entity_type_id,
         'class' => LayoutBuilderLocalTask::class,
+        'cache_contexts' => ['layout_builder_is_active:' . $entity_type_id],
       ];
       $this->derivatives["entity.$entity_type_id.save_layout"] = $base_plugin_definition + [
         'route_name' => "entity.$entity_type_id.save_layout",
@@ -64,6 +65,7 @@ public function getDerivativeDefinitions($base_plugin_definition) {
         'parent_id' => "layout_builder_ui:entity.$entity_type_id.layout_builder",
         'entity_type_id' => $entity_type_id,
         'class' => LayoutBuilderLocalTask::class,
+        'cache_contexts' => ['layout_builder_is_active:' . $entity_type_id],
       ];
       $this->derivatives["entity.$entity_type_id.cancel_layout"] = $base_plugin_definition + [
         'route_name' => "entity.$entity_type_id.cancel_layout",
@@ -72,6 +74,7 @@ public function getDerivativeDefinitions($base_plugin_definition) {
         'entity_type_id' => $entity_type_id,
         'class' => LayoutBuilderLocalTask::class,
         'weight' => 5,
+        'cache_contexts' => ['layout_builder_is_active:' . $entity_type_id],
       ];
     }
 
diff --git a/core/modules/layout_builder/tests/src/FunctionalJavascript/LayoutBuilderTest.php b/core/modules/layout_builder/tests/src/FunctionalJavascript/LayoutBuilderTest.php
index eefe63be34..13ad29e300 100644
--- a/core/modules/layout_builder/tests/src/FunctionalJavascript/LayoutBuilderTest.php
+++ b/core/modules/layout_builder/tests/src/FunctionalJavascript/LayoutBuilderTest.php
@@ -77,36 +77,42 @@ protected function setUp() {
       'configure any layout',
       'administer node display',
     ], 'foobar'));
+  }
+
+  /**
+   * Tests the Layout Builder UI.
+   */
+  public function testLayoutBuilderUi() {
+    $assert_session = $this->assertSession();
+    $page = $this->getSession()->getPage();
+
+    // Ensure the block is not displayed initially.
+    $this->drupalGet($this->node->toUrl('canonical'));
+    $assert_session->pageTextContains('The node body');
+    $assert_session->pageTextNotContains('Powered by Drupal');
+    $assert_session->linkNotExists('Layout');
 
     // Enable layout support.
     $this->drupalGet('admin/structure/types/manage/bundle_with_section_field/display');
-    $page = $this->getSession()->getPage();
     $page->checkField('layout[allow_custom]');
     $page->pressButton('Save');
-  }
-
-  /**
-   * Tests the Layout Builder UI.
-   */
-  public function testLayoutBuilderUi() {
-    $assert_session = $this->assertSession();
-    $page = $this->getSession()->getPage();
-
-    // Ensure the block is not displayed initially.
-    $this->drupalGet($this->node->toUrl('canonical'));
-    $assert_session->pageTextNotContains('Powered by Drupal');
 
     // Enter the layout editing mode.
+    $this->drupalGet($this->node->toUrl('canonical'));
+    $assert_session->pageTextNotContains('The node body');
+    $assert_session->linkExists('Layout');
     $this->clickLink('Layout');
     $this->markCurrentPage();
     $assert_session->linkExists('Add Section');
     $assert_session->linkNotExists('Add Block');
 
     // Add a new section.
+    $assert_session->linkExists('Add Section');
     $this->clickLink('Add Section');
     $assert_session->assertWaitOnAjaxRequest();
     $assert_session->elementExists('css', '#drupal-off-canvas');
 
+    $assert_session->linkExists('One column');
     $this->clickLink('One column');
     $assert_session->assertWaitOnAjaxRequest();
     $assert_session->elementNotExists('css', '#drupal-off-canvas');
@@ -115,11 +121,13 @@ public function testLayoutBuilderUi() {
     $assert_session->linkExists('Add Block');
 
     // Add a new block.
+    $assert_session->linkExists('Add Block');
     $this->clickLink('Add Block');
     $assert_session->assertWaitOnAjaxRequest();
 
     $assert_session->elementExists('css', '#drupal-off-canvas');
 
+    $assert_session->linkExists('Powered by Drupal');
     $this->clickLink('Powered by Drupal');
     $assert_session->assertWaitOnAjaxRequest();
     $assert_session->elementExists('css', '#drupal-off-canvas');
@@ -146,6 +154,7 @@ public function testLayoutBuilderUi() {
     $assert_session->pageTextContains('Powered by Drupal');
 
     // Save the layout, and the new block is visible.
+    $assert_session->linkExists('Save Layout');
     $this->clickLink('Save Layout');
     $assert_session->addressEquals($this->node->toUrl('canonical'));
     $assert_session->pageTextContains('Powered by Drupal');
@@ -334,21 +343,31 @@ public function testLayoutNoDialog() {
    * @todo Workaround for https://www.drupal.org/node/2918718.
    */
   protected function clickContextualLink($selector, $link_locator, $force_visible = TRUE) {
+    $assert_session = $this->assertSession();
+
     if ($force_visible) {
       $this->getSession()->executeScript("jQuery('{$selector} .contextual .trigger').removeClass('visually-hidden');");
+      $assert_session->assertWaitOnAjaxRequest();
     }
 
     $element = $this->getSession()->getPage()->find('css', $selector);
     $link = $element->findLink($link_locator);
-    // If the link cannot be found, click the contextual link button first.
-    if (!$link || !$link->isVisible()) {
-      $element->find('css', '.contextual button')->press();
-      $link = $element->findLink($link_locator);
+    if (!$link) {
+      $this->fail("Link $link_locator was found");
+    }
+    else {
+      // If the link is not visible, click the contextual link button first.
+      if (!$link->isVisible()) {
+        $element->find('css', '.contextual button')->press();
+        $assert_session->assertWaitOnAjaxRequest();
+      }
+      $this->assertTrue($link->isVisible(), "Link $link_locator is visible.");
+      $link->click();
     }
-    $link->click();
 
     if ($force_visible) {
       $this->getSession()->executeScript("jQuery('{$selector} .contextual .trigger').addClass('visually-hidden');");
+      $assert_session->assertWaitOnAjaxRequest();
     }
   }