diff --git a/packages/react-native-renderer/src/ReactFiberConfigFabric.js b/packages/react-native-renderer/src/ReactFiberConfigFabric.js
index c3b8ac4d35..4e66ce3738 100644
--- a/packages/react-native-renderer/src/ReactFiberConfigFabric.js
+++ b/packages/react-native-renderer/src/ReactFiberConfigFabric.js
@@ -58,7 +58,6 @@ import {
 } from './ReactNativeFiberInspector';
 
 import {
-  enableFabricCompleteRootInCommitPhase,
   passChildrenWhenCloningPersistedNodes,
   enableLazyPublicInstanceInFabric,
 } from 'shared/ReactFeatureFlags';
@@ -534,19 +533,14 @@ export function finalizeContainerChildren(
   container: Container,
   newChildren: ChildSet,
 ): void {
-  if (!enableFabricCompleteRootInCommitPhase) {
-    completeRoot(container.containerTag, newChildren);
-  }
+  // Noop - children will be replaced in replaceContainerChildren
 }
 
 export function replaceContainerChildren(
   container: Container,
   newChildren: ChildSet,
 ): void {
-  // Noop - children will be replaced in finalizeContainerChildren
-  if (enableFabricCompleteRootInCommitPhase) {
-    completeRoot(container.containerTag, newChildren);
-  }
+  completeRoot(container.containerTag, newChildren);
 }
 
 export {getClosestInstanceFromNode as getInstanceFromNode};
diff --git a/packages/shared/ReactFeatureFlags.js b/packages/shared/ReactFeatureFlags.js
index 295c7f4763..a3bb0f9a5d 100644
--- a/packages/shared/ReactFeatureFlags.js
+++ b/packages/shared/ReactFeatureFlags.js
@@ -96,11 +96,6 @@ export const enableSwipeTransition = __EXPERIMENTAL__;
 
 export const enableScrollEndPolyfill = __EXPERIMENTAL__;
 
-/**
- * Switches the Fabric API from doing layout in commit work instead of complete work.
- */
-export const enableFabricCompleteRootInCommitPhase = false;
-
 /**
  * Switches Fiber creation to a simple object instead of a constructor.
  */
diff --git a/packages/shared/forks/ReactFeatureFlags.native-fb-dynamic.js b/packages/shared/forks/ReactFeatureFlags.native-fb-dynamic.js
index f28fa7c3ba..089693d679 100644
--- a/packages/shared/forks/ReactFeatureFlags.native-fb-dynamic.js
+++ b/packages/shared/forks/ReactFeatureFlags.native-fb-dynamic.js
@@ -23,7 +23,6 @@ export const enableHiddenSubtreeInsertionEffectCleanup = __VARIANT__;
 export const enablePersistedModeClonedFlag = __VARIANT__;
 export const enableShallowPropDiffing = __VARIANT__;
 export const passChildrenWhenCloningPersistedNodes = __VARIANT__;
-export const enableFabricCompleteRootInCommitPhase = __VARIANT__;
 export const enableSiblingPrerendering = __VARIANT__;
 export const enableUseEffectCRUDOverload = __VARIANT__;
 export const enableFastAddPropertiesInDiffing = __VARIANT__;
diff --git a/packages/shared/forks/ReactFeatureFlags.native-fb.js b/packages/shared/forks/ReactFeatureFlags.native-fb.js
index f74e32b209..a77ef6a38a 100644
--- a/packages/shared/forks/ReactFeatureFlags.native-fb.js
+++ b/packages/shared/forks/ReactFeatureFlags.native-fb.js
@@ -20,7 +20,6 @@ const dynamicFlags: DynamicExportsType = (dynamicFlagsUntyped: any);
 // the exports object every time a flag is read.
 export const {
   alwaysThrottleRetries,
-  enableFabricCompleteRootInCommitPhase,
   enableHiddenSubtreeInsertionEffectCleanup,
   enableObjectFiber,
   enablePersistedModeClonedFlag,
diff --git a/packages/shared/forks/ReactFeatureFlags.native-oss.js b/packages/shared/forks/ReactFeatureFlags.native-oss.js
index 2eaf6add41..c1dea3b37f 100644
--- a/packages/shared/forks/ReactFeatureFlags.native-oss.js
+++ b/packages/shared/forks/ReactFeatureFlags.native-oss.js
@@ -30,7 +30,6 @@ export const enableAsyncIterableChildren = false;
 export const enableCPUSuspense = false;
 export const enableCreateEventHandleAPI = false;
 export const enableDO_NOT_USE_disableStrictPassiveEffect = false;
-export const enableFabricCompleteRootInCommitPhase = false;
 export const enableMoveBefore = true;
 export const enableFizzExternalRuntime = true;
 export const enableHalt = false;
diff --git a/packages/shared/forks/ReactFeatureFlags.test-renderer.js b/packages/shared/forks/ReactFeatureFlags.test-renderer.js
index e113d72471..ea8c78abb5 100644
--- a/packages/shared/forks/ReactFeatureFlags.test-renderer.js
+++ b/packages/shared/forks/ReactFeatureFlags.test-renderer.js
@@ -36,7 +36,6 @@ export const enableUseEffectEventHook = false;
 export const favorSafetyOverHydrationPerf = true;
 export const enableLegacyFBSupport = false;
 export const enableMoveBefore = false;
-export const enableFabricCompleteRootInCommitPhase = false;
 export const enableHiddenSubtreeInsertionEffectCleanup = false;
 export const enableHydrationLaneScheduling = true;
 
diff --git a/packages/shared/forks/ReactFeatureFlags.test-renderer.native-fb.js b/packages/shared/forks/ReactFeatureFlags.test-renderer.native-fb.js
index cdb0c83229..8bcdb5e82e 100644
--- a/packages/shared/forks/ReactFeatureFlags.test-renderer.native-fb.js
+++ b/packages/shared/forks/ReactFeatureFlags.test-renderer.native-fb.js
@@ -60,7 +60,6 @@ export const renameElementSymbol = false;
 export const retryLaneExpirationMs = 5000;
 export const syncLaneExpirationMs = 250;
 export const transitionLaneExpirationMs = 5000;
-export const enableFabricCompleteRootInCommitPhase = false;
 export const enableSiblingPrerendering = true;
 export const enableUseEffectCRUDOverload = true;
 export const enableHydrationLaneScheduling = true;
diff --git a/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js b/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js
index 5e235f6c07..f45d6a6f66 100644
--- a/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js
+++ b/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js
@@ -39,7 +39,6 @@ export const favorSafetyOverHydrationPerf = true;
 export const enableLegacyFBSupport = false;
 export const enableMoveBefore = false;
 export const enableRenderableContext = false;
-export const enableFabricCompleteRootInCommitPhase = false;
 export const enableHiddenSubtreeInsertionEffectCleanup = true;
 
 export const enableRetryLaneExpiration = false;
diff --git a/packages/shared/forks/ReactFeatureFlags.www.js b/packages/shared/forks/ReactFeatureFlags.www.js
index d321f456e8..27bf13230e 100644
--- a/packages/shared/forks/ReactFeatureFlags.www.js
+++ b/packages/shared/forks/ReactFeatureFlags.www.js
@@ -50,7 +50,6 @@ export const enableProfilerTimer = __PROFILE__;
 export const enableProfilerCommitHooks = __PROFILE__;
 export const enableProfilerNestedUpdatePhase = __PROFILE__;
 export const enableUpdaterTracking = __PROFILE__;
-export const enableFabricCompleteRootInCommitPhase = false;
 
 export const enableSuspenseAvoidThisFallback = true;