diff --git a/gui/src/main/java/com/devonfw/ide/gui/App.java b/gui/src/main/java/com/devonfw/ide/gui/App.java
index 125c37ecdd..74f1902ae7 100644
--- a/gui/src/main/java/com/devonfw/ide/gui/App.java
+++ b/gui/src/main/java/com/devonfw/ide/gui/App.java
@@ -128,7 +128,8 @@ private Parent loadMainView() throws IOException {
 
     FXMLLoader fxmlLoader = new FXMLLoader(App.class.getResource("main-view.fxml"));
     fxmlLoader.setResources(this.nlsService.getResourceBundle());
-    fxmlLoader.setController(new MainController(System.getenv(IdeVariables.IDE_ROOT.getName()), guiStateManager, this.nlsService));
+    MainController controller = new MainController(System.getenv(IdeVariables.IDE_ROOT.getName()), guiStateManager, this.nlsService);
+    fxmlLoader.setControllerFactory(type -> controller);
     return fxmlLoader.load();
   }
 
diff --git a/gui/src/main/java/com/devonfw/ide/gui/MainController.java b/gui/src/main/java/com/devonfw/ide/gui/MainController.java
index cfeba46e6f..4ef28c5cab 100644
--- a/gui/src/main/java/com/devonfw/ide/gui/MainController.java
+++ b/gui/src/main/java/com/devonfw/ide/gui/MainController.java
@@ -127,12 +127,19 @@ private void setUpTaskListListener() {
     taskManager.getTasks().addListener(taskListChangeListener);
   }
 
+  /**Guard to ensure {@link #initialize()} runs only once across all FXML files.*/
+  private boolean initialized;
+
   @FXML
   private void initialize() {
 
+    if (this.initialized) {
+      return;
+    }
     setProjectsComboBox();
     initLanguageComboBox();
     selectedWorkspace.setOnAction(this::onWorkspaceSelected);
+    this.initialized = true;
   }
 
   private void onWorkspaceSelected(ActionEvent actionEvent) {
diff --git a/gui/src/main/resources/com/devonfw/ide/gui/main-view.fxml b/gui/src/main/resources/com/devonfw/ide/gui/main-view.fxml
index 320f7abadb..693e355919 100644
--- a/gui/src/main/resources/com/devonfw/ide/gui/main-view.fxml
+++ b/gui/src/main/resources/com/devonfw/ide/gui/main-view.fxml
@@ -6,6 +6,7 @@
 <?import javafx.scene.layout.*?>
 <?import java.lang.Double?>
 <BorderPane fx:id="rootPane"
+  fx:controller="com.devonfw.ide.gui.MainController"
   maxHeight="-Infinity"
   maxWidth="-Infinity"
   VBox.vgrow="ALWAYS"
@@ -13,86 +14,7 @@
   xmlns:fx="http://javafx.com/fxml/1">
 
   <left>
-    <VBox prefHeight="428.0"
-      prefWidth="181.0"
-      spacing="4.0"
-      stylesheets="@style/navigation.css"
-      BorderPane.alignment="CENTER">
-      <padding>
-        <Insets bottom="10.0" left="10.0" right="10.0" top="10.0"/>
-      </padding>
-
-      <HBox alignment="CENTER_LEFT" prefWidth="200.0">
-        <VBox.margin>
-          <Insets bottom="10.0"/>
-        </VBox.margin>
-        <ImageView fitHeight="150.0"
-          fitWidth="200.0"
-          pickOnBounds="true"
-          preserveRatio="true">
-          <Image url="@assets/logo.png"/>
-        </ImageView>
-      </HBox>
-
-      <VBox maxHeight="-Infinity"
-        prefWidth="100.0"
-        styleClass="sideNavigationElement">
-        <padding>
-          <Insets left="8.0" right="8.0"/>
-        </padding>
-        <Label fx:id="labelProject"
-          maxWidth="1.7976931348623157E308"
-          text="%project"/>
-        <ComboBox fx:id="selectedProject"
-          maxWidth="1.7976931348623157E308"
-          minWidth="-Infinity"
-          prefHeight="40.0"
-          prefWidth="150.0"
-          promptText="%chooseProject"
-          styleClass="chooseProject"/>
-      </VBox>
-
-      <VBox layoutX="20.0"
-        layoutY="245.0"
-        maxHeight="-Infinity"
-        prefWidth="100.0"
-        styleClass="sideNavigationElement">
-        <padding>
-          <Insets left="8.0" right="8.0"/>
-        </padding>
-        <Label fx:id="labelWorkspace"
-          maxWidth="1.7976931348623157E308"
-          text="%workspace"/>
-        <ComboBox fx:id="selectedWorkspace"
-          disable="true"
-          maxWidth="1.7976931348623157E308"
-          minWidth="-Infinity"
-          prefHeight="40.0"
-          prefWidth="150.0"
-          promptText="%chooseWorkspace"
-          styleClass="chooseProject"
-          VBox.vgrow="ALWAYS"/>
-      </VBox>
-
-      <!-- Language selector -->
-      <VBox maxHeight="-Infinity"
-        prefWidth="100.0"
-        styleClass="sideNavigationElement">
-        <padding>
-          <Insets left="8.0" right="8.0"/>
-        </padding>
-        <Label fx:id="labelLanguage"
-          maxWidth="1.7976931348623157E308"
-          text="%language"/>
-        <ComboBox fx:id="selectedLanguage"
-          maxWidth="1.7976931348623157E308"
-          minWidth="-Infinity"
-          prefHeight="40.0"
-          prefWidth="150.0"
-          promptText="%chooseLanguage"
-          styleClass="chooseProject"/>
-      </VBox>
-    </VBox>
+    <fx:include source="navigation.fxml" BorderPane.alignment="CENTER"/>
   </left>
 
   <center>
@@ -110,9 +32,8 @@
           <Insets bottom="10.0" left="10.0" right="10.0" top="10.0"/>
         </padding>
 
+        <!-- Android Studio -->
         <HBox alignment="CENTER_LEFT"
-          layoutX="20.0"
-          layoutY="204.0"
           prefHeight="100.0"
           prefWidth="150.0"
           spacing="20.0"
@@ -152,9 +73,8 @@
           </HBox>
         </HBox>
 
+        <!-- Eclipse -->
         <HBox alignment="CENTER_LEFT"
-          layoutX="20.0"
-          layoutY="120.0"
           prefHeight="100.0"
           prefWidth="150.0"
           spacing="20.0"
@@ -193,9 +113,8 @@
           </HBox>
         </HBox>
 
+        <!-- IntelliJ -->
         <HBox alignment="CENTER_LEFT"
-          layoutX="20.0"
-          layoutY="20.0"
           prefHeight="100.0"
           prefWidth="150.0"
           spacing="20.0"
@@ -235,6 +154,7 @@
           </HBox>
         </HBox>
 
+        <!-- VS Code -->
         <HBox alignment="CENTER_LEFT"
           prefHeight="100.0"
           prefWidth="150.0"
@@ -279,21 +199,6 @@
   </center>
 
   <bottom>
-    <HBox fx:id="bottomPanelContainer"
-      alignment="CENTER_RIGHT"
-      prefHeight="40.0"
-      prefWidth="200.0"
-      spacing="10.0"
-      BorderPane.alignment="CENTER">
-      <padding>
-        <Insets right="8.0"/>
-      </padding>
-
-      <Label fx:id="statusLabel" text="IDEasy is ready."/>
-      <ProgressBar fx:id="statusProgressBar"
-        prefWidth="0.0"
-        progress="0.0"
-        visible="false"/>
-    </HBox>
+    <fx:include source="status-bar.fxml" BorderPane.alignment="CENTER"/>
   </bottom>
 </BorderPane>
diff --git a/gui/src/main/resources/com/devonfw/ide/gui/navigation.fxml b/gui/src/main/resources/com/devonfw/ide/gui/navigation.fxml
new file mode 100644
index 0000000000..c833c478d2
--- /dev/null
+++ b/gui/src/main/resources/com/devonfw/ide/gui/navigation.fxml
@@ -0,0 +1,87 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<?import javafx.geometry.*?>
+<?import javafx.scene.control.*?>
+<?import javafx.scene.image.*?>
+<?import javafx.scene.layout.*?>
+<VBox fx:id="navigationPanel"
+  fx:controller="com.devonfw.ide.gui.MainController"
+  prefHeight="428.0"
+  prefWidth="181.0"
+  spacing="4.0"
+  stylesheets="@style/navigation.css"
+  xmlns="http://javafx.com/javafx/25.0.0"
+  xmlns:fx="http://javafx.com/fxml/1">
+  <padding>
+    <Insets bottom="10.0" left="10.0" right="10.0" top="10.0"/>
+  </padding>
+
+  <HBox alignment="CENTER_LEFT" prefWidth="200.0">
+    <VBox.margin>
+      <Insets bottom="10.0"/>
+    </VBox.margin>
+    <ImageView fitHeight="150.0"
+      fitWidth="200.0"
+      pickOnBounds="true"
+      preserveRatio="true">
+      <Image url="@assets/logo.png"/>
+    </ImageView>
+  </HBox>
+
+  <VBox maxHeight="-Infinity"
+    prefWidth="100.0"
+    styleClass="sideNavigationElement">
+    <padding>
+      <Insets left="8.0" right="8.0"/>
+    </padding>
+    <Label fx:id="labelProject"
+      maxWidth="1.7976931348623157E308"
+      text="%project"/>
+    <ComboBox fx:id="selectedProject"
+      maxWidth="1.7976931348623157E308"
+      minWidth="-Infinity"
+      prefHeight="40.0"
+      prefWidth="150.0"
+      promptText="%chooseProject"
+      styleClass="chooseProject"/>
+  </VBox>
+
+  <VBox maxHeight="-Infinity"
+    prefWidth="100.0"
+    styleClass="sideNavigationElement">
+    <padding>
+      <Insets left="8.0" right="8.0"/>
+    </padding>
+    <Label fx:id="labelWorkspace"
+      maxWidth="1.7976931348623157E308"
+      text="%workspace"/>
+    <ComboBox fx:id="selectedWorkspace"
+      disable="true"
+      maxWidth="1.7976931348623157E308"
+      minWidth="-Infinity"
+      prefHeight="40.0"
+      prefWidth="150.0"
+      promptText="%chooseWorkspace"
+      styleClass="chooseProject"
+      VBox.vgrow="ALWAYS"/>
+  </VBox>
+
+  <!-- Language selector -->
+  <VBox maxHeight="-Infinity"
+    prefWidth="100.0"
+    styleClass="sideNavigationElement">
+    <padding>
+      <Insets left="8.0" right="8.0"/>
+    </padding>
+    <Label fx:id="labelLanguage"
+      maxWidth="1.7976931348623157E308"
+      text="%language"/>
+    <ComboBox fx:id="selectedLanguage"
+      maxWidth="1.7976931348623157E308"
+      minWidth="-Infinity"
+      prefHeight="40.0"
+      prefWidth="150.0"
+      promptText="%chooseLanguage"
+      styleClass="chooseProject"/>
+  </VBox>
+</VBox>
diff --git a/gui/src/main/resources/com/devonfw/ide/gui/status-bar.fxml b/gui/src/main/resources/com/devonfw/ide/gui/status-bar.fxml
new file mode 100644
index 0000000000..ca57a4e47d
--- /dev/null
+++ b/gui/src/main/resources/com/devonfw/ide/gui/status-bar.fxml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<?import javafx.geometry.*?>
+<?import javafx.scene.control.*?>
+<?import javafx.scene.layout.*?>
+<HBox fx:id="bottomPanelContainer"
+  fx:controller="com.devonfw.ide.gui.MainController"
+  alignment="CENTER_RIGHT"
+  prefHeight="40.0"
+  prefWidth="200.0"
+  spacing="10.0"
+  xmlns="http://javafx.com/javafx/25.0.0"
+  xmlns:fx="http://javafx.com/fxml/1">
+  <padding>
+    <Insets right="8.0"/>
+  </padding>
+
+  <Label fx:id="statusLabel" text="IDEasy is ready."/>
+  <ProgressBar fx:id="statusProgressBar"
+    prefWidth="0.0"
+    progress="0.0"
+    visible="false"/>
+</HBox>
diff --git a/gui/src/test/java/com/devonfw/ide/gui/AppBaseTest.java b/gui/src/test/java/com/devonfw/ide/gui/AppBaseTest.java
index 7486eee82d..220d0b18c9 100644
--- a/gui/src/test/java/com/devonfw/ide/gui/AppBaseTest.java
+++ b/gui/src/test/java/com/devonfw/ide/gui/AppBaseTest.java
@@ -59,7 +59,8 @@ public void start(Stage stage) throws IOException {
     assertThat(mainViewUrl).as("Cannot resolve main UI FXML resource!").isNotNull();
 
     FXMLLoader fxmlLoader = new FXMLLoader(mainViewUrl);
-    fxmlLoader.setController(new MainController(mockIdeRoot.toString(), guiStateManager, nlsService));
+    MainController controller = new MainController(mockIdeRoot.toString(), guiStateManager, nlsService);
+    fxmlLoader.setControllerFactory(type -> controller);
     fxmlLoader.setResources(nlsService.getResourceBundle());
     Parent root = fxmlLoader.load();
     stage.setScene(new Scene(root));