diff --git a/front_end/core/root/Runtime.ts b/front_end/core/root/Runtime.ts
index 4bcdb84f12e..349f3b524b7 100644
--- a/front_end/core/root/Runtime.ts
+++ b/front_end/core/root/Runtime.ts
@@ -320,6 +320,7 @@ export const enum ExperimentName {
   // React Native-specific experiments - must mirror RNExperimentName above
   JS_HEAP_PROFILER_ENABLE = RNExperimentName.JS_HEAP_PROFILER_ENABLE,
   REACT_NATIVE_SPECIFIC_UI = RNExperimentName.REACT_NATIVE_SPECIFIC_UI,
+  NOT_REACT_NATIVE_SPECIFIC_UI = '!' + RNExperimentName.REACT_NATIVE_SPECIFIC_UI,
   ENABLE_PERFORMANCE_PANEL = RNExperimentName.ENABLE_PERFORMANCE_PANEL,
   ENABLE_NETWORK_PANEL = RNExperimentName.ENABLE_NETWORK_PANEL,
 }
diff --git a/front_end/panels/timeline/timeline-meta.ts b/front_end/panels/timeline/timeline-meta.ts
index affda660cf6..2705eca85c6 100644
--- a/front_end/panels/timeline/timeline-meta.ts
+++ b/front_end/panels/timeline/timeline-meta.ts
@@ -152,7 +152,7 @@ UI.ActionRegistration.registerActionExtension({
       shortcut: 'Meta+Shift+E',
     },
   ],
-  experiment: Root.Runtime.ExperimentName.REACT_NATIVE_SPECIFIC_UI, // See https://docs.google.com/document/d/1_mtLIHEd9bFQN4xWBSVDR357GaRo56khB1aOxgWDeu4/edit?tab=t.0 for context.
+  experiment: Root.Runtime.ExperimentName.NOT_REACT_NATIVE_SPECIFIC_UI, // See https://docs.google.com/document/d/1_mtLIHEd9bFQN4xWBSVDR357GaRo56khB1aOxgWDeu4/edit?tab=t.0 for context.
 });
 
 UI.ActionRegistration.registerActionExtension({
diff --git a/front_end/testing/EnvironmentHelpers.ts b/front_end/testing/EnvironmentHelpers.ts
index c1892659484..9515dede968 100644
--- a/front_end/testing/EnvironmentHelpers.ts
+++ b/front_end/testing/EnvironmentHelpers.ts
@@ -132,6 +132,7 @@ const REGISTERED_EXPERIMENTS = [
   Root.Runtime.ExperimentName.TIMELINE_SHOW_POST_MESSAGE_EVENTS,
   Root.Runtime.ExperimentName.TIMELINE_ENHANCED_TRACES,
   Root.Runtime.ExperimentName.REACT_NATIVE_SPECIFIC_UI,
+  Root.Runtime.ExperimentName.NOT_REACT_NATIVE_SPECIFIC_UI,
 ];
 
 export async function initializeGlobalVars({reset = true} = {}) {