diff --git a/packages/react-dom/index.js b/packages/react-dom/index.js
index 30ccf0a2eac89..4357044d90818 100644
--- a/packages/react-dom/index.js
+++ b/packages/react-dom/index.js
@@ -15,11 +15,8 @@ export {
   createRoot,
   hydrateRoot,
   flushSync,
-  render,
-  unmountComponentAtNode,
   unstable_batchedUpdates,
   unstable_createEventHandle,
-  unstable_renderSubtreeIntoContainer,
   unstable_runWithPriority, // DO NOT USE: Temporarily exposed to migrate off of Scheduler.runWithPriority.
   useFormStatus,
   useFormState,
diff --git a/packages/react-dom/index.stable.js b/packages/react-dom/index.stable.js
index a817a6b3d9af3..3d5c05cf30ab8 100644
--- a/packages/react-dom/index.stable.js
+++ b/packages/react-dom/index.stable.js
@@ -13,8 +13,6 @@ export {
   createRoot,
   hydrateRoot,
   flushSync,
-  render,
-  unmountComponentAtNode,
   unstable_batchedUpdates,
   unstable_renderSubtreeIntoContainer,
   useFormStatus,
diff --git a/packages/react-dom/src/__tests__/ReactTestUtils-test.js b/packages/react-dom/src/__tests__/ReactTestUtils-test.js
index e3ed7c71a6883..80871a12d8e52 100644
--- a/packages/react-dom/src/__tests__/ReactTestUtils-test.js
+++ b/packages/react-dom/src/__tests__/ReactTestUtils-test.js
@@ -586,6 +586,7 @@ describe('ReactTestUtils', () => {
   });
 
   // @gate !disableDOMTestUtils
+  // @gate !disableLegacyMode
   it('should call setState callback with no arguments', async () => {
     let mockArgs;
     class Component extends React.Component {
diff --git a/packages/shared/ReactFeatureFlags.js b/packages/shared/ReactFeatureFlags.js
index 4d4fc361f4879..c2d2d3095b3d1 100644
--- a/packages/shared/ReactFeatureFlags.js
+++ b/packages/shared/ReactFeatureFlags.js
@@ -179,7 +179,7 @@ export const enableReactTestRendererWarning = __NEXT_MAJOR__;
 // Disables legacy mode
 // This allows us to land breaking changes to remove legacy mode APIs in experimental builds
 // before removing them in stable in the next Major
-export const disableLegacyMode = __NEXT_MAJOR__;
+export const disableLegacyMode = true;
 
 export const disableDOMTestUtils = __NEXT_MAJOR__;
 
diff --git a/packages/shared/forks/ReactFeatureFlags.test-renderer.js b/packages/shared/forks/ReactFeatureFlags.test-renderer.js
index df84dd4d4cc60..78000e1f7f77d 100644
--- a/packages/shared/forks/ReactFeatureFlags.test-renderer.js
+++ b/packages/shared/forks/ReactFeatureFlags.test-renderer.js
@@ -89,7 +89,7 @@ const __NEXT_MAJOR__ = __EXPERIMENTAL__;
 export const enableRefAsProp = __NEXT_MAJOR__;
 export const disableStringRefs = __NEXT_MAJOR__;
 export const enableBigIntSupport = __NEXT_MAJOR__;
-export const disableLegacyMode = __NEXT_MAJOR__;
+export const disableLegacyMode = true;
 export const disableLegacyContext = __NEXT_MAJOR__;
 export const disableDOMTestUtils = __NEXT_MAJOR__;
 export const enableRenderableContext = __NEXT_MAJOR__;