diff --git a/packages/devtools_app/lib/src/screens/performance/panes/timeline_events/legacy/event_details.dart b/packages/devtools_app/lib/src/screens/performance/panes/timeline_events/legacy/event_details.dart
index 81f2379e024..fba6fd977ba 100644
--- a/packages/devtools_app/lib/src/screens/performance/panes/timeline_events/legacy/event_details.dart
+++ b/packages/devtools_app/lib/src/screens/performance/panes/timeline_events/legacy/event_details.dart
@@ -37,30 +37,39 @@ class EventDetails extends StatelessWidget {
     // (see html_event_details.dart).
     final theme = Theme.of(context);
     return OutlineDecoration(
-      child: Column(
-        crossAxisAlignment: CrossAxisAlignment.start,
-        children: [
-          AreaPaneHeader(
-            needsTopBorder: false,
-            tall: true,
-            title: Text(_generateHeaderText()),
-            actions: [
-              CpuSamplingRateDropdown(
-                screenId: PerformanceScreen.id,
-                profilePeriodFlagNotifier:
-                    legacyController.cpuProfilerController.profilePeriodFlag!,
+      child: DualValueListenableBuilder<bool, Flag>(
+        firstListenable: offlineController.offlineMode,
+        secondListenable:
+            legacyController.cpuProfilerController.profilerFlagNotifier!,
+        builder: (context, offline, profilerFlag, _) {
+          final profilerEnabled = profilerFlag.valueAsString == 'true';
+          return Column(
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              AreaPaneHeader(
+                needsTopBorder: false,
+                tall: true,
+                title: Text(_generateHeaderText()),
+                actions: [
+                  if (selectedEvent != null &&
+                      selectedEvent!.isUiEvent &&
+                      !offline &&
+                      profilerEnabled)
+                    CpuSamplingRateDropdown(
+                      screenId: PerformanceScreen.id,
+                      profilePeriodFlagNotifier: legacyController
+                          .cpuProfilerController.profilePeriodFlag!,
+                    ),
+                ],
+              ),
+              Expanded(
+                child: selectedEvent != null
+                    ? _buildDetails(offline, profilerEnabled)
+                    : _buildInstructions(theme),
               ),
             ],
-          ),
-          Expanded(
-            child: selectedEvent != null
-                ? ValueListenableBuilder<bool>(
-                    valueListenable: offlineController.offlineMode,
-                    builder: (context, offline, _) => _buildDetails(offline),
-                  )
-                : _buildInstructions(theme),
-          ),
-        ],
+          );
+        },
       ),
     );
   }
@@ -74,7 +83,7 @@ class EventDetails extends StatelessWidget {
         '${selected.name} (${msText(selected.time.duration)})';
   }
 
-  Widget _buildDetails(bool offlineMode) {
+  Widget _buildDetails(bool offlineMode, bool profilerEnabled) {
     final selected = selectedEvent!;
     if (selected.isUiEvent) {
       // In [offlineController.offlineMode], we do not need to worry about
@@ -82,15 +91,9 @@ class EventDetails extends StatelessWidget {
       if (offlineMode) {
         return _buildCpuProfiler(legacyController.cpuProfilerController);
       }
-      return ValueListenableBuilder<Flag>(
-        valueListenable:
-            legacyController.cpuProfilerController.profilerFlagNotifier!,
-        builder: (context, profilerFlag, _) {
-          return profilerFlag.valueAsString == 'true'
-              ? _buildCpuProfiler(legacyController.cpuProfilerController)
-              : CpuProfilerDisabled(legacyController.cpuProfilerController);
-        },
-      );
+      return profilerEnabled
+          ? _buildCpuProfiler(legacyController.cpuProfilerController)
+          : CpuProfilerDisabled(legacyController.cpuProfilerController);
     }
     return EventSummary(selected);
   }
diff --git a/packages/devtools_app/test/performance/timeline_events/legacy/event_details_test.dart b/packages/devtools_app/test/performance/timeline_events/legacy/event_details_test.dart
index f34a1e8f749..3b8ca999935 100644
--- a/packages/devtools_app/test/performance/timeline_events/legacy/event_details_test.dart
+++ b/packages/devtools_app/test/performance/timeline_events/legacy/event_details_test.dart
@@ -7,6 +7,7 @@ import 'package:devtools_app/src/screens/performance/panes/timeline_events/legac
 import 'package:devtools_app/src/screens/profiler/cpu_profiler.dart';
 import 'package:devtools_app/src/service/vm_flags.dart' as vm_flags;
 import 'package:devtools_app/src/shared/config_specific/import_export/import_export.dart';
+import 'package:devtools_app/src/shared/ui/vm_flag_widgets.dart';
 import 'package:devtools_test/devtools_test.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
@@ -55,6 +56,19 @@ void main() {
         (WidgetTester tester) async {
       await pumpEventDetails(goldenUiTimelineEvent, tester);
       expect(find.byType(CpuProfiler), findsOneWidget);
+      expect(find.byType(CpuSamplingRateDropdown), findsOneWidget);
+      expect(find.byType(CpuProfilerDisabled), findsNothing);
+      expect(find.byType(EventSummary), findsOneWidget);
+      expect(find.text(EventDetails.noEventSelected), findsNothing);
+      expect(find.text(EventDetails.instructions), findsNothing);
+    });
+
+    testWidgetsWithWindowSize('builds for UI event in offline mode', windowSize,
+        (WidgetTester tester) async {
+      offlineController.enterOfflineMode();
+      await pumpEventDetails(goldenUiTimelineEvent, tester);
+      expect(find.byType(CpuProfiler), findsOneWidget);
+      expect(find.byType(CpuSamplingRateDropdown), findsNothing);
       expect(find.byType(CpuProfilerDisabled), findsNothing);
       expect(find.byType(EventSummary), findsOneWidget);
       expect(find.text(EventDetails.noEventSelected), findsNothing);
@@ -65,6 +79,7 @@ void main() {
         (WidgetTester tester) async {
       await pumpEventDetails(goldenRasterTimelineEvent, tester);
       expect(find.byType(CpuProfiler), findsNothing);
+      expect(find.byType(CpuSamplingRateDropdown), findsNothing);
       expect(find.byType(CpuProfilerDisabled), findsNothing);
       expect(find.byType(EventSummary), findsOneWidget);
       expect(find.text(EventDetails.noEventSelected), findsNothing);
@@ -75,6 +90,7 @@ void main() {
         (WidgetTester tester) async {
       await pumpEventDetails(asyncEventWithInstantChildren, tester);
       expect(find.byType(CpuProfiler), findsNothing);
+      expect(find.byType(CpuSamplingRateDropdown), findsNothing);
       expect(find.byType(CpuProfilerDisabled), findsNothing);
       expect(find.byType(EventSummary), findsOneWidget);
       expect(find.text(EventDetails.noEventSelected), findsNothing);
@@ -85,6 +101,7 @@ void main() {
         (WidgetTester tester) async {
       await pumpEventDetails(null, tester);
       expect(find.byType(CpuProfiler), findsNothing);
+      expect(find.byType(CpuSamplingRateDropdown), findsNothing);
       expect(find.byType(CpuProfilerDisabled), findsNothing);
       expect(find.byType(EventSummary), findsNothing);
       expect(find.text(EventDetails.noEventSelected), findsOneWidget);
@@ -96,6 +113,7 @@ void main() {
       await serviceManager.service!.setFlag(vm_flags.profiler, 'false');
       await pumpEventDetails(goldenUiTimelineEvent, tester);
       expect(find.byType(CpuProfiler), findsNothing);
+      expect(find.byType(CpuSamplingRateDropdown), findsNothing);
       expect(find.byType(CpuProfilerDisabled), findsOneWidget);
       expect(find.byType(EventSummary), findsNothing);
       expect(find.text(EventDetails.noEventSelected), findsNothing);
@@ -105,6 +123,7 @@ void main() {
       await tester.pumpAndSettle();
 
       expect(find.byType(CpuProfiler), findsOneWidget);
+      expect(find.byType(CpuSamplingRateDropdown), findsOneWidget);
       expect(find.byType(CpuProfilerDisabled), findsNothing);
       expect(find.byType(EventSummary), findsOneWidget);
     });