diff --git a/.idea/modules.xml b/.idea/modules.xml
index 5543eb66b35c..096b14b6a71f 100644
--- a/.idea/modules.xml
+++ b/.idea/modules.xml
@@ -1012,6 +1012,7 @@
       <module fileurl="file://$PROJECT_DIR$/platform/ml-impl/intellij.platform.ml.impl.iml" filepath="$PROJECT_DIR$/platform/ml-impl/intellij.platform.ml.impl.iml" />
       <module fileurl="file://$PROJECT_DIR$/platform/navbar/shared/intellij.platform.navbar.iml" filepath="$PROJECT_DIR$/platform/navbar/shared/intellij.platform.navbar.iml" />
       <module fileurl="file://$PROJECT_DIR$/platform/navbar/backend/intellij.platform.navbar.backend.iml" filepath="$PROJECT_DIR$/platform/navbar/backend/intellij.platform.navbar.backend.iml" />
+      <module fileurl="file://$PROJECT_DIR$/platform/navbar.compatibility/monolith/intellij.platform.navbar.compatibility.monolith.iml" filepath="$PROJECT_DIR$/platform/navbar.compatibility/monolith/intellij.platform.navbar.compatibility.monolith.iml" />
       <module fileurl="file://$PROJECT_DIR$/platform/navbar.compatibility/testFramework/intellij.platform.navbar.compatibility.testFramework.iml" filepath="$PROJECT_DIR$/platform/navbar.compatibility/testFramework/intellij.platform.navbar.compatibility.testFramework.iml" />
       <module fileurl="file://$PROJECT_DIR$/platform/navbar/ide/intellij.platform.navbar.ide.iml" filepath="$PROJECT_DIR$/platform/navbar/ide/intellij.platform.navbar.ide.iml" />
       <module fileurl="file://$PROJECT_DIR$/platform/navbar/vm/intellij.platform.navbar.vm.iml" filepath="$PROJECT_DIR$/platform/navbar/vm/intellij.platform.navbar.vm.iml" />
diff --git a/platform/lang-impl/src/com/intellij/ide/navbar/ide/IdeNavBarVmItem.kt b/platform/lang-impl/src/com/intellij/ide/navbar/ide/IdeNavBarVmItem.kt
index 2733e15f82e8..acfd94cecf71 100644
--- a/platform/lang-impl/src/com/intellij/ide/navbar/ide/IdeNavBarVmItem.kt
+++ b/platform/lang-impl/src/com/intellij/ide/navbar/ide/IdeNavBarVmItem.kt
@@ -12,7 +12,7 @@ import com.intellij.platform.navbar.backend.impl.children
 import com.intellij.util.concurrency.ThreadingAssertions
 import com.intellij.util.concurrency.annotations.RequiresReadLock
 
-internal class IdeNavBarVmItem @RequiresReadLock constructor(
+class IdeNavBarVmItem @RequiresReadLock constructor(
   item: NavBarItem,
 ) : NavBarVmItem {
 
@@ -70,7 +70,7 @@ private suspend fun <T> IdeNavBarVmItem.fetch(selector: NavBarItem.() -> T): T?
   }
 }
 
-internal fun List<NavBarItem>.toVmItems(): List<NavBarVmItem> {
+fun List<NavBarItem>.toVmItems(): List<NavBarVmItem> {
   return map {
     IdeNavBarVmItem(it)
   }
diff --git a/platform/lang-impl/src/com/intellij/ide/navbar/impl/DefaultNavBarItem.kt b/platform/lang-impl/src/com/intellij/ide/navbar/impl/DefaultNavBarItem.kt
index 3c818ca08ae3..f64d1f866161 100644
--- a/platform/lang-impl/src/com/intellij/ide/navbar/impl/DefaultNavBarItem.kt
+++ b/platform/lang-impl/src/com/intellij/ide/navbar/impl/DefaultNavBarItem.kt
@@ -5,8 +5,6 @@ import com.intellij.icons.AllIcons
 import com.intellij.ide.navigationToolbar.NavBarModelExtension
 import com.intellij.ide.projectView.ProjectView
 import com.intellij.ide.projectView.impl.ProjectRootsUtil
-import com.intellij.injected.editor.VirtualFileWindow
-import com.intellij.lang.LangBundle
 import com.intellij.model.Pointer
 import com.intellij.model.Pointer.hardPointer
 import com.intellij.openapi.editor.colors.CodeInsightColors.ERRORS_ATTRIBUTES
@@ -36,7 +34,6 @@ import com.intellij.refactoring.suggested.createSmartPointer
 import com.intellij.ui.SimpleTextAttributes
 import com.intellij.ui.SimpleTextAttributes.*
 import com.intellij.util.IconUtil
-import com.intellij.util.asSafely
 import com.intellij.util.concurrency.annotations.RequiresBackgroundThread
 import com.intellij.util.concurrency.annotations.RequiresReadLock
 import com.intellij.util.ui.JBUI
@@ -80,7 +77,7 @@ open class DefaultNavBarItem<out T>(val data: T) : NavBarItem {
 }
 
 
-internal class ProjectNavBarItem(data: Project) : DefaultNavBarItem<Project>(data), Pointer<NavBarItem> {
+class ProjectNavBarItem(data: Project) : DefaultNavBarItem<Project>(data), Pointer<NavBarItem> {
 
   override fun createPointer(): Pointer<out NavBarItem> = this
 
diff --git a/platform/navbar.compatibility/monolith/intellij.platform.navbar.compatibility.monolith.iml b/platform/navbar.compatibility/monolith/intellij.platform.navbar.compatibility.monolith.iml
new file mode 100644
index 000000000000..5d44c61fed22
--- /dev/null
+++ b/platform/navbar.compatibility/monolith/intellij.platform.navbar.compatibility.monolith.iml
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/resources" type="java-resource" />
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" packagePrefix="com.intellij.platform.navbar.compatibility.monolith" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="kotlin-stdlib" level="project" />
+    <orderEntry type="module" module-name="intellij.platform.core" />
+    <orderEntry type="module" module-name="intellij.platform.core.ui" />
+    <orderEntry type="module" module-name="intellij.platform.lang.impl" />
+    <orderEntry type="module" module-name="intellij.platform.navbar.backend" />
+    <orderEntry type="module" module-name="intellij.platform.navbar.ide" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/platform/navbar.compatibility/monolith/resources/intellij.platform.navbar.compatibility.monolith.xml b/platform/navbar.compatibility/monolith/resources/intellij.platform.navbar.compatibility.monolith.xml
new file mode 100644
index 000000000000..12988032e561
--- /dev/null
+++ b/platform/navbar.compatibility/monolith/resources/intellij.platform.navbar.compatibility.monolith.xml
@@ -0,0 +1,7 @@
+<idea-plugin package="com.intellij.platform.navbar.compatibility.monolith">
+  <extensions defaultExtensionNs="com.intellij">
+    <!--suppress PluginXmlValidity -->
+    <projectService serviceInterface="com.intellij.platform.navbar.ide.NavBarServiceDelegate"
+                    serviceImplementation="com.intellij.platform.navbar.compatibility.monolith.MonolithNavbarServiceDelegate"/>
+  </extensions>
+</idea-plugin>
diff --git a/platform/lang-impl/src/com/intellij/ide/navbar/ide/MonolithNavBarServiceDelegate.kt b/platform/navbar.compatibility/monolith/src/MonolithNavBarServiceDelegate.kt
similarity index 90%
rename from platform/lang-impl/src/com/intellij/ide/navbar/ide/MonolithNavBarServiceDelegate.kt
rename to platform/navbar.compatibility/monolith/src/MonolithNavBarServiceDelegate.kt
index 86fc619e413d..2d33789b02e9 100644
--- a/platform/lang-impl/src/com/intellij/ide/navbar/ide/MonolithNavBarServiceDelegate.kt
+++ b/platform/navbar.compatibility/monolith/src/MonolithNavBarServiceDelegate.kt
@@ -1,7 +1,10 @@
 // Copyright 2000-2024 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
-package com.intellij.ide.navbar.ide
+package com.intellij.platform.navbar.compatibility.monolith
 
 import com.intellij.codeInsight.navigation.actions.navigateRequest
+import com.intellij.ide.navbar.ide.IdeNavBarVmItem
+import com.intellij.ide.navbar.ide.fireOnFileChanges
+import com.intellij.ide.navbar.ide.toVmItems
 import com.intellij.ide.navbar.impl.ProjectNavBarItem
 import com.intellij.openapi.actionSystem.DataContext
 import com.intellij.openapi.application.EDT
diff --git a/platform/platform-resources/src/META-INF/LangExtensions.xml b/platform/platform-resources/src/META-INF/LangExtensions.xml
index 8d02cf38f9de..fe1fd49e3411 100644
--- a/platform/platform-resources/src/META-INF/LangExtensions.xml
+++ b/platform/platform-resources/src/META-INF/LangExtensions.xml
@@ -694,8 +694,6 @@
 
     <ideRootPaneNorth implementation="com.intellij.ide.navigationToolbar.experimental.NewToolbarRootPaneExtension" order="first"/>
     <navbar implementation="com.intellij.ide.navigationToolbar.DefaultNavBarExtension" id="defaultNavbar" order="last"/>
-    <projectService serviceInterface="com.intellij.platform.navbar.ide.NavBarServiceDelegate"
-                    serviceImplementation="com.intellij.ide.navbar.ide.MonolithNavbarServiceDelegate"/>
     <applicationService serviceInterface="com.intellij.modcommand.ModCommandExecutor"
                         serviceImplementation="com.intellij.lang.impl.modcommand.ModCommandExecutorImpl" overrides="true"/>
 
diff --git a/platform/platform-resources/src/META-INF/PlatformLangPlugin.xml b/platform/platform-resources/src/META-INF/PlatformLangPlugin.xml
index 151232499a7f..e6cd43b9771d 100644
--- a/platform/platform-resources/src/META-INF/PlatformLangPlugin.xml
+++ b/platform/platform-resources/src/META-INF/PlatformLangPlugin.xml
@@ -9,6 +9,7 @@
 
   <!-- should be here, otherwise not loaded in tests (in unit test mode, the platform prefix is `PlatformLangXml) -->
   <content>
+    <module name="intellij.platform.navbar.compatibility.monolith"/>
     <module name="intellij.platform.settings.local"/>
   </content>