diff --git a/packages/shared/forks/ReactFeatureFlags.native-fb-dynamic.js b/packages/shared/forks/ReactFeatureFlags.native-fb-dynamic.js
index 91a518a905154..c87bda1f57c19 100644
--- a/packages/shared/forks/ReactFeatureFlags.native-fb-dynamic.js
+++ b/packages/shared/forks/ReactFeatureFlags.native-fb-dynamic.js
@@ -22,7 +22,6 @@ import typeof * as DynamicFlagsType from 'ReactNativeInternalFeatureFlags';
 
 export const alwaysThrottleRetries = __VARIANT__;
 export const enableDeferRootSchedulingToMicrotask = __VARIANT__;
-export const enableUnifiedSyncLane = __VARIANT__;
 export const enableUseRefAccessWarning = __VARIANT__;
 export const passChildrenWhenCloningPersistedNodes = __VARIANT__;
 export const useMicrotasksForSchedulingInFabric = __VARIANT__;
diff --git a/packages/shared/forks/ReactFeatureFlags.native-fb.js b/packages/shared/forks/ReactFeatureFlags.native-fb.js
index 2ff22ed4053cf..3d0c70ef5f8d6 100644
--- a/packages/shared/forks/ReactFeatureFlags.native-fb.js
+++ b/packages/shared/forks/ReactFeatureFlags.native-fb.js
@@ -20,7 +20,6 @@ import * as dynamicFlags from 'ReactNativeInternalFeatureFlags';
 export const {
   alwaysThrottleRetries,
   enableDeferRootSchedulingToMicrotask,
-  enableUnifiedSyncLane,
   enableUseRefAccessWarning,
   passChildrenWhenCloningPersistedNodes,
   useMicrotasksForSchedulingInFabric,
@@ -44,13 +43,14 @@ export const enableFormActions = true; // Doesn't affect Native
 export const enableBinaryFlight = true;
 export const enableTaint = true;
 export const enablePostpone = false;
-export const debugRenderPhaseSideEffectsForStrictMode = true;
+export const debugRenderPhaseSideEffectsForStrictMode = __DEV__;
 export const disableJavaScriptURLs = false;
 export const disableCommentsAsDOMContainers = true;
 export const disableInputAttributeSyncing = false;
 export const disableIEWorkarounds = true;
 export const replayFailedUnitOfWorkWithInvokeGuardedCallback = __DEV__;
 export const enableScopeAPI = false;
+export const enableUnifiedSyncLane = true;
 export const enableCreateEventHandleAPI = false;
 export const enableSuspenseCallback = false;
 export const disableLegacyContext = false;
@@ -74,9 +74,9 @@ export const transitionLaneExpirationMs = 5000;
 
 export const disableSchedulerTimeoutInWorkLoop = false;
 export const enableLazyContextPropagation = false;
-export const enableLegacyHidden = true;
+export const enableLegacyHidden = false;
 export const forceConcurrentByDefaultForTesting = false;
-export const allowConcurrentByDefault = true;
+export const allowConcurrentByDefault = false;
 export const enableCustomElementPropertySupport = false;
 
 export const consoleManagedByDevToolsDuringStrictMode = false;
diff --git a/packages/shared/forks/ReactFeatureFlags.native-oss.js b/packages/shared/forks/ReactFeatureFlags.native-oss.js
index 82a903537ca9f..b9705b2762a5f 100644
--- a/packages/shared/forks/ReactFeatureFlags.native-oss.js
+++ b/packages/shared/forks/ReactFeatureFlags.native-oss.js
@@ -10,7 +10,7 @@
 import typeof * as FeatureFlagsType from 'shared/ReactFeatureFlags';
 import typeof * as ExportsType from './ReactFeatureFlags.native-oss';
 
-export const debugRenderPhaseSideEffectsForStrictMode = false;
+export const debugRenderPhaseSideEffectsForStrictMode = __DEV__;
 export const enableDebugTracing = false;
 export const enableAsyncDebugInfo = false;
 export const enableSchedulingProfiler = false;
@@ -74,11 +74,11 @@ export const enableFloat = true;
 export const useModernStrictMode = false;
 export const enableDO_NOT_USE_disableStrictPassiveEffect = false;
 export const enableFizzExternalRuntime = false;
-export const enableDeferRootSchedulingToMicrotask = true;
+export const enableDeferRootSchedulingToMicrotask = false;
 
 export const enableAsyncActions = false;
 
-export const alwaysThrottleRetries = true;
+export const alwaysThrottleRetries = false;
 
 export const useMicrotasksForSchedulingInFabric = false;
 export const passChildrenWhenCloningPersistedNodes = false;
diff --git a/packages/shared/forks/ReactFeatureFlags.test-renderer.native.js b/packages/shared/forks/ReactFeatureFlags.test-renderer.native.js
index ac23fa99c85c4..51a47ee52f2ac 100644
--- a/packages/shared/forks/ReactFeatureFlags.test-renderer.native.js
+++ b/packages/shared/forks/ReactFeatureFlags.test-renderer.native.js
@@ -71,7 +71,7 @@ export const enableFloat = true;
 
 export const useModernStrictMode = false;
 export const enableDO_NOT_USE_disableStrictPassiveEffect = false;
-export const enableDeferRootSchedulingToMicrotask = true;
+export const enableDeferRootSchedulingToMicrotask = false;
 
 export const enableAsyncActions = true;
 
diff --git a/scripts/flow/xplat.js b/scripts/flow/xplat.js
index b2c4709a3b566..223a5f7d90300 100644
--- a/scripts/flow/xplat.js
+++ b/scripts/flow/xplat.js
@@ -10,7 +10,6 @@
 declare module 'ReactNativeInternalFeatureFlags' {
   declare export var alwaysThrottleRetries: boolean;
   declare export var enableDeferRootSchedulingToMicrotask: boolean;
-  declare export var enableUnifiedSyncLane: boolean;
   declare export var enableUseRefAccessWarning: boolean;
   declare export var passChildrenWhenCloningPersistedNodes: boolean;
   declare export var useMicrotasksForSchedulingInFabric: boolean;